Scoring explained

How the Composite Score Works

AP Biology reports a single score from 1 to 5, built from two equally weighted 90-minute sections:

• Section I: Multiple Choice (50%) — 60 four-option questions in Bluebook (60 raw points).
• Section II: Free Response (50%) — 6 questions viewed in Bluebook and answered by hand in a paper booklet (34 raw points: two 9-point long questions and four 4-point short questions).

Because both sections carry the exact same weight (50%) despite having different raw point totals, one free-response point is worth significantly more than one multiple-choice point.

The Weighting Formula

Courselo calculates your estimated weighted score fraction ($x$, expressed as a percentage from 0% to 100%) using the exact 50/50 split:

Look closely at the denominators:

• Each MCQ point adds $\frac{0.50}{60} \approx 0.83\%$ to your overall composite.
• Each FRQ point adds $\frac{0.50}{34} \approx 1.47\%$ to your overall composite.

There is no penalty for wrong answers on either section. On Section I, an unanswered question is a guaranteed zero, whereas a random guess on a four-option item gives you a 25% chance of gaining $0.83\%$.

Estimated Score Cutoffs and Targets

College Board does not use fixed percentage cutoffs (like 90% for an A in a school class). Instead, psychometricians equate each year’s exam after administration to account for slight variations in question difficulty, ensuring that a score of 3, 4, or 5 represents the same level of mastery every year.

Courselo maps your weighted fraction $x$ to the 1–5 scale using these realistic estimates (the Course and Exam Description gives no cutoffs, and College Board does not publish them in advance):