35 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 APES questions have answers that look almost identical; small wording differences matter.
Eliminate before guessing. APES distractors often include true statements that don't answer the actual question. Cross out anything irrelevant first.
Know your species interactions cold. Mutualism, commensalism, parasitism, competition, and predation are tested constantly: know the +/− notation for each.
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.