25 multiple-choice questions in College Board exam style. Each has four choices and a full explanation of why each option is right or wrong.
Read the question carefully before looking at the choices. Many AP Bio questions have answers that look almost identical; small wording differences matter.
Eliminate before guessing. AP Bio distractors often include true statements that don't answer the actual question. Cross out anything irrelevant first.
For Hardy-Weinberg problems, write out p, q, p², 2pq, and q² before doing anything else. Most errors come from plugging numbers into the wrong term, not from the algebra itself.
Read the explanations even when you got it right. Each one teaches a small fact that often returns in a different form on the exam.