AP Biology Practice Tests
Free AP Biology practice tests covering all 8 units with detailed explanations.
AP Biology is organized into 8 units, starting with Chemistry of Life and ending with Ecology. Our practice content is aligned to the current College Board Course & Exam Description so the questions you see here cover the same skills as the real exam, including a timed full-length practice that mirrors the actual paper.
There are 14 practice tests for AP Biology right now, sorted by difficulty so you can warm up easy or push into exam-level questions. Every multiple-choice question comes with a written explanation and a rationale for each wrong choice, and each unit has a worked-solutions page you can read straight through.
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Practice by unit
Convert a raw score to an estimated 1–5 AP score.
Timed practice with 60 questions mirroring the real exam structure.
FRQ analyses and walkthroughs by year.