Digital SAT September 2026: Nine Files Compared Through Evidence, Algebra, and Earlier Tests

Last updated: October 2026 · By the AllSatPapers Content Team

September’s nine files offer several different kinds of practice: conventional-length four-module sequences, collections with repeated Module 2 blocks, a file with missing positions, and a large section-based bank. The current PDFs contain 1,232 pages and 1,210 question occurrences. Those occurrences include shared families; they should not be described as 1,210 unique questions or nine independent tests of equal length.

The month’s most instructive questions require students to preserve the exact relationship being tested. A result must contradict a specific prediction, not a neighboring claim. A historical record can change its sample without proving that the population changed. A table may measure a proxy rather than the outcome discussed in the passage. In Math, a radius formula needs its sign condition, while an absolute-value equation needs both branches and a check against the original. This overview connects those ideas across the files and the earlier archive, then turns the comparisons into a practical study sequence.

Explore the September 2026 Digital SAT papers and available answer keys

Coverage, answer support, and the right practice role

The supplied labels describe the archive, not a verified adaptive path or an official difficulty ranking. A repeated Module 2 heading does not establish which route an individual student took. Compare files by the questions and answer support actually present. In particular, 9C has more question blocks than key tables, so a matching answer on one page is not enough to certify the association of an entire repeated block.

Within-month differences that change the study plan

9F, 9G, and 9H: convenient sequences still need checked answers

These three files each preserve 54 English and 44 Math questions with four following keys. That makes them easier to organize into a single sequence than the longer compilations. However, the current 9G and 9H absolute-value items each disagree with their printed key. In 9G p.73, 2|5x−1|=6x+9 has solutions 11/4 and −7/16, whose sum is 37/16; p.79 prints 55/16. In 9H p.57, 2|5x−1|=8x+3 has solutions 5/2 and −1/18, summing to 22/9; p.79 prints 71/36. Preserve the corrections before checking an attempt. These are specific disagreements, not a claim that every other key entry is wrong.

9A, 9C, 9D, and 9E: extra blocks require deliberate selection

The larger compilations contain repeated Module 2 blocks rather than one uninterrupted ordinary test. Record the PDF page as well as the module and question number, since those numbers can recur. 9D has six separately positioned keys and an explicitly shorter final Math block of twenty questions. 9C has four key pages for six blocks, leaving repeated Module 2 coverage ambiguous. 9A and 9E have no appended key. Use these differences to decide whether a block is suited to independent review, guided explanation, or a targeted problem set. Page count alone does not establish how much independently gradable practice is available.

9B: separate absent positions from damaged questions

The file lacks English Module 1 Q1, Math Module 1 Q1, and Math Module 2 Q11. There are also defects on pages that are present: Math Module 1 Q19 at p.71 has blank B–D choices, and Math Module 2 Q22 at p.95 omits the target expression. A complete derivation may still be possible for a displayed stem even when its answer options are damaged, but an answer letter cannot be defended from missing choices. An omitted target is a different problem: it leaves the reader without a specified quantity to find. Keep those cases outside a strict raw-score tally and use intact examples for diagnosis.

9I: use a bank to test transfer, not endurance alone

The 235-question section bank is useful for assembling short sets around a method. It includes examples related to other September files, such as the community-trail vocabulary and decreasing-exponential table. Recognition can be useful when the task is to explain a relationship, but it reduces the value of an item as an unseen assessment. Choose a few connected questions, describe what remains constant, and then move to one that changes the target or representation. That approach gives the bank a clear purpose without treating its greater length as a reason to complete it indiscriminately.

Six worked cases: the decision behind the answer

9A: Reverse the precise prediction, not an unrelated comparison

2026 9A · Reading & Writing Module 1 Q14 · PDF p. 14

The researchers predict that moderate-complexity “Kashmir” will receive higher groove ratings than high-complexity “In the Stone”; the result is contrary to that prediction.

Reasoned answer: the ratings for “Kashmir” were lower than those for “In the Stone.” No key is included; the selected comparison contradicts the stated prediction.

The prediction can be reduced to one comparison: Kashmir > In the Stone. “Contrary to the hypothesis” requires a result that conflicts with that ordering. The option saying Kashmir received lower ratings reverses the stated comparison directly. You do not need to know either song or decide whether you personally enjoy moving to it.

The options about fans of either band introduce subgroups that the hypothesis never mentions. An option comparing Kashmir with songs without syncopation also changes the reference group. Even if that statement were true, it would not contradict the prediction about these two songs. The subtlety is that a choice can sound like a finding about music while answering a different experimental question.

Treat the hypothesis as a relationship between named quantities before considering explanatory background. The definition of syncopation explains why the researchers made their prediction; it is not a license to replace their specific test with a broad claim that all moderate music is preferred. For timed work, write the two song labels with the predicted inequality, then look for its reversal. In review, identify which distractors changed the population or comparison rather than merely calling them irrelevant.

9C: Separate a changing sample from a changing population

2026 9C · Reading & Writing Module 2 Q15 · PDF p. 70

Probate inventories increasingly represent affluent people, while scholars use them to infer a broad consumer revolution.

Reasoned answer: A, the inventories may have led scholars to overstate changes across the broader population. A follows from the sampling-bias argument.

The criticism concerns who appears in the records. If later inventories disproportionately describe affluent individuals, an increase in goods recorded there may reflect a shift in the represented group rather than a similarly broad change across society. The records could accurately describe the possessions of each listed person and still give a misleading picture of population-wide ownership.

C incorrectly treats the problem as exaggerated counts within wealthy people’s inventories. D changes the claim to an increase in the proportion of wealthy people in England itself; the text establishes a change in the documentation’s coverage, not necessarily in the population. B largely repeats the original consumer-revolution interpretation and does not address the new sampling concern.

This is a selection-bias argument. Draw two boxes: the population and the documented subset. Clark’s finding changes the relationship between those boxes over time. It does not prove that no consumer revolution occurred; it raises a possibility that the available evidence overstates its breadth. The qualified conclusion is therefore stronger reasoning than an absolute rejection. In timed work, ask “Did the phenomenon change, or did the observed group change?” before reading the options.

9E: Keep sex, month, and measurement aligned

2026 9E · Reading & Writing Module 2 Q8 · PDF p. 62

A table reports male and female wing centroid sizes in months with different temperatures; the passage connects body size with reproductive fitness.

Reasoned answer: A, female wing centroid size is 2.27 mm in May and 2.31 mm in July. No key is included; A correctly compares female wing centroid sizes across May and July.

The comparison must hold sex constant while moving between a cooler and warmer month. May has lower reported high and low temperatures than July, and the female wing centroid size rises from 2.27 to 2.31 millimeters. The passage uses wing size as a proxy for body size and states that body size correlates with reproductive fitness. That supplied connection makes the size comparison relevant to the claim about fitness.

The table does not directly count offspring or measure reproductive success. Its numerical entries are wing measurements. A comparison between sexes in one month changes the wrong variable; temperature values alone establish which month is warmer but supply no evidence about the flies. Another distractor attaches a familiar size to the wrong sex. The numbers can be copied accurately while their labels are misread.

Trace each selected entry through its row and column headings. Then state the inference in two stages: cooler-month females have smaller average wings, and the passage connects the size proxy to reproductive fitness. This is more precise than calling 2.27 a fitness score. The finding supports the stated association without proving temperature alone caused every difference. Under time pressure, preserve sex, month, measured variable, and unit before considering any broader biological explanation.

9D: Use semicolons to separate internally punctuated list items

2026 9D · Reading & Writing Module 2 Q15 · PDF p. 71

COBOL, Harbour, and Clojure are each followed by a developer-and-date description.

Answer: D, the option separating the three described languages with semicolons. The second Module 2 key on p.84 gives D.

The sentence’s main structure is “The programming languages COBOL; Harbour; and Clojure are all routinely translated…” Each language comes with a nonessential descriptive phrase containing commas. Semicolons distinguish the larger list boundaries from those internal commas. The correct choice closes the first item after 1959, separates the second after 1999, and leaves Clojure followed by its own descriptive comma.

The wrong options mix boundary levels. One uses a semicolon for the first separation but a comma for the next; another detaches developed from the language it describes; another omits a comma needed to enclose a descriptive phrase. Looking only at the nearest year cannot resolve these differences. You must map all three items and their attached descriptions.

Use a three-column mental list: language, developer, year. Then restore the sentence around it. The semicolons here are list separators rather than boundaries between independent clauses, so the common simplified rule about semicolons joining complete sentences is not sufficient. This question rewards the same structural reading used for a list of books with descriptive clauses, even though the subject matter is programming.

9F: Complete both squares and use the positivity condition

2026 9F · Math Module 1 Q6 · PDF p. 62

x²+2ax+y²−6y−14a=40, where a>0. Find the circle’s radius.

Answer: D, a+7. The first math key on p.79 gives D.

Group the x and y terms, then complete their squares: x²+2ax=(x+a)²−a² and y²−6y=(y−3)²−9. Moving the constants gives(x+a)²+(y−3)²=a²+14a+49=(a+7)². In standard circle form, the right side is the radius squared.

Taking the square root normally gives the absolute value |a+7|. The condition a>0 ensures a+7 is positive, so the radius is a+7. The center is(−a,3), but neither coordinate is the requested radius. The distractors invite you to stop at an incomplete square or read a coefficient as a geometric length.

The efficient approach preserves the expression in a rather than choosing a numerical value for it. A numerical check can confirm a candidate but cannot by itself establish a formula for every permitted a. Watch the sign when moving−14a across the equals sign: it becomes+14a. The resulting perfect square is the structural clue that the parameter was chosen deliberately. This is a representation problem—general form to center-radius form—rather than a graph-reading exercise.

9G: Solve both absolute-value branches and audit the supplied key

2026 9G · Math Module 1 Q17 · PDF p. 73

2|5x−1|=6x+9. Find the sum of the solutions.

Corrected answer: 37/16. Verified by our team: the printed p.79 value55/16 is inconsistent with the displayed equation; the corrected sum is37/16.

For 5x−1≥0, use 2(5x−1)=6x+9. For 5x−1<0, use −2(5x−1)=6x+9. Solving the two linear equations gives 11/4 and −7/16. Each candidate must satisfy its branch condition and the original equation; squaring both sides without checking would make it easier to retain an invalid candidate.

The valid roots sum to 37/16. The supplied Math Module 1 key prints 55/16, which conflicts with the equation on the question page. This is an independently checked correction, not a claim that the printed key supports our result. The original question and the key are both included in the image evidence so the disagreement can be reviewed directly.

The right side depends on x, so the roots need not be symmetric about x=1/5, the vertex of the absolute-value graph. A graph of the V-shaped left side and the line on the right offers a useful second check: their intersections are the solutions. Algebra supplies the exact fractions; the graph checks that the number and approximate positions of the intersections make sense. Keep the branch inequalities visible until both solutions have been validated.

Broader comparisons with the earlier archive

The following pairs are selected from the individually reviewed comparisons in the September articles. Each identifies a current page and a specific earlier source, then explains the change in task, wording, numbers, or representation. A shared scientific topic is labeled as related context when the actual operation differs; a near-repeat is not presented as a wholly new item. These examples support a study plan, not a global overlap percentage.

2025 11B · PDF p. 13: Skill analogue

September location: 2026 9A · Reading & Writing Module 1 Q14 · PDF p. 14.

The November 2025 passage contrasts enjoyment of syncopated samba with reactions to Scelsi’s unfamiliar tonal interference. Its conclusion distinguishes kinds of complexity rather than declaring all complexity pleasant or unpleasant. The current groove question instead asks for a finding contrary to a particular song ranking. Both require tracking what the study actually predicts, but the answer directions differ: qualified synthesis in the older item, reversal of a prediction here. Practice by writing the expected relationship in plain language before looking at the options.

2025 9G · PDF p. 13: Skill analogue

September location: 2026 9D · Reading & Writing Module 2 Q15 · PDF p. 71.

The September 2025 planetary-discovery item introduces a list of exoplanets with distance descriptions. A colon follows the complete introductory clause, and semicolons organize the descriptive items. The current programming sentence places descriptive developer-and-date material inside each language entry. Both require distinguishing punctuation within an item from punctuation between items. The exact blank differs, so the older colon is not the answer here; its list structure helps explain why the current semicolons are needed.

2026 6B · PDF p. 41: Retuned evidence selection

September location: 2026 9E · Reading & Writing Module 2 Q8 · PDF p. 62.

June 2026 6B uses the fruit-fly wing-size table and asks for evidence of lower reproductive fitness in cooler months. Its supported choice compares male wing centroid size in May and July. The current choice compares female values,2.27 and 2.31 millimeters, across those months. Both preserve sex while changing temperature context, but the relevant cells differ. This is a useful near-repeat for learning to read labels instead of remembering a number. Neither version directly measures reproductive fitness in the table; that connection is supplied by the passage.

2025 8D · PDF p. 43: Retuned circle equation

September location: 2026 9F · Math Module 1 Q6 · PDF p. 62.

August 2025 8D uses x²+2ax+y²+8y−12a=20, which becomes(x+a)²+(y+4)²=(a+6)². The current y coefficient and constant terms instead produce(x+a)²+(y−3)²=(a+7)². The same completing-square method applies to both coordinates, while the positivity condition removes the absolute value from the radius. The older answer six belongs to a different radius expression; it cannot be carried into the current a+7.

2025 11D · PDF p. 50: Skill analogue with changed branch geometry

September location: 2026 9G · Math Module 1 Q17 · PDF p. 73.

November 2025 11D gives(|3x−30|+3)/6=5, which reduces to|3x−30|=27. Its solutions 1 and 19 are symmetric about 10, and their sum is 20. The current equation has 6x+9 on the right, so it compares an absolute-value graph with a sloped line. The same two-branch method applies, but the symmetry shortcut does not. Solving produces 11/4 and−7/16, both valid, and the resulting 37/16 also exposes the current key error. The difference in the right-hand side is the crucial change.

2025 5E · PDF p. 17: Retuned research comparison

September location: 2026 9A · Reading & Writing Module 2 Q16 · PDF p. 43.

The May 2025 item uses wild tuco-tucos and white-throated sparrows to challenge claims based on laboratory behavior. One option reports a wild observation without a laboratory counterpart, so it cannot test the proposed lab–wild difference. The current sloth version changes the animal and behavioral measure while preserving that evidentiary gap. A striking fact is not automatically relevant evidence. Identify the missing comparison before debating whether the observed sleep or activity pattern sounds unusual.

2025 12F · PDF p. 160: Reused subject with a changed cross-text task

September location: 2026 9A · Reading & Writing Module 2 Q7 · PDF p. 61.

The December 2025 sashiko item compares one text’s account of intrinsic qualities with another text’s discussion of mingei and its relationship to other cultural production. It asks how the treatments differ. The current sashiko–kantha item asks what the traditions share: aesthetic functions alongside practical origins. Knowing that both questions concern embroidery is insufficient. The older task rewards contrast between perspectives; the current task rewards a common proposition supported by both texts. Mark the question verb before transferring any remembered interpretation.

2025 8E · PDF p. 51: Retuned data set

September location: 2026 9A · Math Module 2 Q5 · PDF p. 130.

August 2025 8E lists group G as 9, 15, 18, 18, 24 and group H as 15, 18, 18, 24. Both medians are 18. The current lists change the values and yield 19, while keeping the odd-versus-even comparison structure. The central pair in the four-entry list must be averaged even when its values happen to match. This is a near-identical calculation pattern, but the older result does not supply the new numerical median. A useful follow-up is to change just one central entry and explain why the equality would then disappear.

2025 8C · PDF p. 70: Retuned quadratic model

September location: 2026 9A · Math Module 2 Q19 · PDF p. 144.

August 2025 8C uses f(x)=4x²+64x+257=4(x+8)²+1 and g(x)=f(x+7). The minimum is 1 even though the vertex moves to x=−15. Here completing the square produces 3(x+5)²+1, and the additional input shift is 6. The new vertex occurs at x=−11, while its height again remains 1. The repeated answer is a consequence of the coefficients, not a general rule that every shifted quadratic has minimum 1. Distinguish the x-coordinate at which the minimum occurs from the minimum output itself.

2025 11A · PDF p. 33: Retuned algebraic structure

September location: 2026 9A · Math Module 2 Q22 · PDF p. 147.

The November 2025 expression is y²(x−2)−36(x−2)³. Factoring out x−2 leaves y²−[6(x−2)]², producing the linear factor y+6x−12. The current item changes the shift to 6 and the square-root coefficient to 3, so the corresponding factor becomes y+3x−18. The reusable method is common factor first, difference of squares second. Neither the older answer letter nor its constant term transfers. Keeping the inner factor intact until the last step also prevents a sign error when distributing the shift.

Section analysis: where September’s difficulty comes from

Reading & Writing: control the comparison and the strength of the claim

The music-prediction item makes a specific ordering between two named songs. A result about a different comparison group can be interesting without contradicting that ordering. The consumer-record item questions whether the documented sample represents society consistently over time; it does not establish that every wealthy person’s inventory is inaccurate. The wing-size table supplies a proxy linked to reproductive fitness in the passage; it does not directly count offspring. In all three, the reader must preserve the measured quantity, the comparison group, and the strength of the inference.

That precision also applies to sentence function and cross-text questions. The gene-transfer passage’s final sentence revises a previous perception rather than defining a concept again. The Lorde comparison distinguishes valuable poetic production from professional publication conditions. A good answer can challenge the scope of a claim without rejecting every fact in the other passage. Review by writing a short sentence that identifies exactly what the evidence changes and what it leaves unresolved. This is more useful than labeling every wrong option “too broad” without explaining which noun, condition, or degree of certainty was broadened.

Grammar and synthesis: identify the role before weighing the content

September’s complex lists demonstrate why punctuation should follow structure. Each programming language has an internal description, so semicolons separate larger items that already contain commas. The same rule can appear in a literary list with completely different vocabulary. Notes-synthesis and transition tasks similarly require the requested rhetorical role to guide selection: a correct fact is useful only if it introduces, compares, supports, or challenges in the way the goal specifies. Under timed conditions, identify that role before rereading every detail. On review, reconstruct the sentence or goal without its specialized names to see which relationship decides the answer.

Math: domain checks and changing bases are part of the solution

The circle parameter case reaches a squared radius of (a+7)², but the radius is initially |a+7|; the condition a>0 permits the simpler a+7. The absolute-value cases require branch conditions and substitution into the original equation before adding roots. These are not optional finishing details. They determine which algebraic results answer the question.

Other September families reward tracking the quantity that changes. In the exponential-growth item at 9E p.144, a 120-second interval must be converted to two minutes before reading a growth factor from the exponent. In mixture questions, the total amount and the amount of salt are separate constraints; returning the mass of solution when asked for its salt contribution changes the target. In horizontal-shift questions, distinguish the input location of a minimum from its output value. Use one short line stating the target and units before calculating, then check that the final number is expressed at that same level.

A study sequence for the nine files

1. Choose a usable first sequence. Start with 9F, or use 9G/9H after annotating the demonstrated key corrections. Record any familiar items before interpreting the result.
2. Review by the exact error. Separate wrong comparison group, overstated inference, misread proxy, punctuation hierarchy, lost domain condition, and wrong requested quantity.
3. Add selected blocks. Use 9D’s separately keyed blocks for extra work. With 9C, record which repeated block and key are being consulted; with 9A/9E, arrange independent answer checking.
4. Use older pairs for transfer. Explain which part of the method survives a changed name, value, task, or representation. An earlier answer letter is not a solution to the current question.
5. Use 9B and 9I purposefully. Exclude incomplete 9B items from scoring and select bank questions around a known weakness. Finish on unfamiliar intact material when you need a fresh diagnostic.

A strong review session ends with explanations, not just corrected letters. For one English item, identify the strongest distractor and the relationship it changes. For one Math item, explain the condition that makes the shortest method valid. Then solve a related earlier question with a changed target. If the method transfers while the answer changes appropriately, the comparison has done its job. The September collection offers ample material for that process, provided source gaps and repeated content remain visible in the plan.

Every Digital SAT Paper in Our Archive

Our archived files are grouped below by their supplied labels; regional labels and dates describe the archive, rather than independent authentication of an administration.

2023

• March 2023 (3A) · May 2023 (5A) · June 2023 (6A, Easy & Hard) · October 2023 (10A) · November 2023 (11A) · December 2023 (12A–12D)

2024

• March 2024 (3A–3D) · May 2024 (5A–5D) · June 2024 (6A–6E) · August 2024 (8A–8I) · October 2024 (10A–10G) · November 2024 (11A–11F) · December 2024 (12A–12H)

2025

• March 2025 (3A–3H) · May 2025 (5A–5F) · June 2025 (6A–6E) · August 2025 (8A–8F + 8G Question Bank) · September 2025 (9A–9I + 9J Question Bank) · October 2025 (10A–10H, 10I/10J School Day, 10K Question Bank) · November 2025 (11A–11G) · December 2025 (12A Math only, 12B English only, 12C, 12D, 12E, 12F Question Bank)

2026

• March 2026 (3A Question Bank, 3B, 3C US, 3D US English only) · May 2026 (5A, 5B, 5C–5H English only) · June 2026 (6A–6D, 6E Math only, 6F/6G English only, 6H Question Bank, 6I–6K) · August 2026 (8A–8D International, 8E collection labeled “4Sets”, 8F/8G US, 8H International Question Bank) · September 2026 (9A–9C International, 9D–9H US, 9I International Question Bank) · October 2026 (10A–10D International, 10E International English only, 10F–10I US, 10J International Question Bank, 10K US Question Bank; School Day files labeled October 8, October 13 sets 1/2, October 14, October 17 sets 1/2).

Continue with the complete papers

Get the Digital SAT papers and available answer keys and use each individual September article for its complete source checks and worked examples.

Keywords: September 2026 SAT, Digital SAT QAS, DSAT 9A–9I, Reading and Writing analysis, SAT Math, answer-key corrections, earlier-test comparison.

SAT is a registered trademark of the College Board. AllSatPapers is not affiliated with or endorsed by the College Board. This guide analyzes the supplied archive; selected answer checks do not certify every item or independently establish official provenance.