September 13 2025 DSAT – Test 9J (Question Bank): Sample Questions & Full Analysis

Expert Breakdown of the September 2025 Digital SAT (Test 9J Question Bank)

Welcome to the allsatpapers.com expert analysis! As specialists in official test materials, we have something special for you today. The file known as 13 September 2025 DSAT (Test 9J) is not a standard, sequential test. It is a master question bank, containing over 380 questions from all sections and difficulty levels. This is the pool of questions from which the various test forms (like 9A, 9B, 9C, etc.) for the September 2025 administration were created.

This makes Test 9J an invaluable study tool. It gives you a "behind-the-scenes" look at the full range of questions the College Board prepared for this test date. This post will analyze key question types from this bank to help you master the DSAT.

Section 1: Reading & Writing Module 1 (Key Passages)

The first R&W module is designed to set your baseline. Here are two of the most common "Module 1" style questions found in the 9J bank. You will likely recognize them from other test forms, which proves this bank is the source.

Section 1: Reading & Writing Module 2 (Adaptive) Analysis

This module's difficulty adapts based on your performance in Module 1. The questions become more complex, testing more nuanced vocabulary and text structures. Here are some key passages from the Module 2 section of the 9J bank.

Section 2: Math Module 1 Analysis

The first math module in the 9J bank features a standard mix of algebra, data analysis, and geometry. The focus is on foundational skills and straightforward application.

Core Concepts on Display

• Linear Models (Question 89): "A marine biologist uses a linear model... weighs 5,310 pounds at birth and gains 10.0 pounds per hour... for 120 hours... what is the estimated weight... 3 hours after it is born?"
  Analysis: This is a simple linear function: $W(h) = 10h + 5310$, where $h$ is hours.
  $W(3) = 10(3) + 5310 = 30 + 5310 = 5340$.
  The answer is 5340. This is a classic "interpret the linear model" question.
• Polynomial Factors (Question 94): "If the given function is graphed in the xy-plane... $f(x) = 2(x - 1)(x - 6)(x - 9)$... what is the x-coordinate of an x-intercept of the graph?"
  Analysis: This question tests the relationship between a polynomial's factored form and its roots (x-intercepts). The x-intercepts occur when $f(x) = 0$. The roots are $x=1$, $x=6$, and $x=9$. Any of these could be the answer. The question asks for *an* x-coordinate, so 1, 6, or 9 would be correct.

Section 2: Math Module 2 (Adaptive) Analysis

This module increases the complexity, requiring multi-step problem-solving and a deeper understanding of algebraic structures. The 9J bank shows the full range of these harder questions.

Advanced Applications

• Circle Equations & Perpendicular Lines (Question 143): "A circle in the xy-plane has its center at $(-2, 2)$. Line $t$ is tangent to this circle at the point $(7, -5)$. Which of the following points also lies on line $t$?"
  Analysis: This is a high-level coordinate geometry problem that combines two concepts:
  1. Find the slope of the radius from the center $(-2, 2)$ to the tangent point $(7, -5)$.
     $\text{Slope}_{\text{radius}} = \frac{-5 - 2}{7 - (-2)} = \frac{-7}{9}$.
  2. The tangent line is perpendicular to the radius. Its slope is the negative reciprocal.
     $\text{Slope}_{t} = -1 / (-\frac{7}{9}) = \frac{9}{7}$.
  3. Now use point-slope form for line $t$ with the point $(7, -5)$: $y - y_1 = m(x - x_1)$.
     $y - (-5) = \frac{9}{7}(x - 7)$
  4. $y + 5 = \frac{9}{7}x - 9$
  5. $y = \frac{9}{7}x - 14$.
  6. Finally, test the answer choices. Let's test (C) $(14, 4)$:
     $4 = \frac{9}{7}(14) - 14 \rightarrow 4 = 9(2) - 14 \rightarrow 4 = 18 - 14 \rightarrow 4 = 4$. It works.

  The correct answer is (C) (14, 4).

• Advanced Quadratics (Question 138): "In the given equation, $x^2 - 40x + c = 0$, $c$ is a constant. The equation has no real solutions if $c > n$. What is the least possible value of $n$?"
  Analysis:
  1. "No real solutions" means the discriminant ($b^2 - 4ac$) must be less than 0.
  2. In this equation, $a = 1$, $b = -40$, and $c = c$.
  3. $(-40)^2 - 4(1)(c) < 0$
  4. $1600 - 4c < 0$
  5. $1600 < 4c$
  6. $400 < c$

  The problem states the equation has no real solutions if $c > n$. We found it has no real solutions if $c > 400$. Therefore, the least possible value of $n$ is (D) 400.

Overall Difficulty and Analysis of Test 9J

After a comprehensive review of this question bank, here is our expert assessment:

• Overall Difficulty: A full spectrum (Easy, Medium, and Hard).
• Analysis: This 9J file is not a single test; it is a master question bank. It contains the full range of difficulties, from the easiest "Module 1" questions to the most difficult "Module 2" questions, which are designed to challenge 700+ scorers. The "unknown (68)" and "unknown (70)" sections likely represent the Module 1 questions for R&W and Math, while the "easy (68)" and "hard (50)" R&W sections and "easy (72)" and "hard (53)" Math sections represent the different adaptive paths for Module 2.
• Value to Students: This is one of the most valuable study tools a student could have. By practicing from this bank, you are studying the entire set of ingredients that the College Board used to build the September 2025 tests. You can see all the variations of a single question type (like the "domesticated plant" or "moth scales" passages) and master the underlying logic.

Why This Question Bank is Essential For Your Prep

DSAT Test 9J (13 September 2025) is a "behind-the-scenes" look at the Digital SAT. It shows:

• Question Pooling: You can see how the SAT re-uses the same passages and concepts with minor tweaks (e.g., "io moth" vs. "emperor moth").
• The Full Difficulty Range: You can practice the easiest *and* the hardest questions the SAT has to offer, all in one file.
• Concept Repetition: You can clearly identify the high-frequency concepts, like "Words in Context," "Difference of Squares," "Linear Models," and "Circle Equations," that the SAT tests repeatedly.

Studying with this question bank is like having the teacher's answer key for the entire chapter, not just the one quiz you were given. It allows for a deeper, more comprehensive understanding of the test's design.