<p>building on theeboy3’s response:</p>
<p>Do OFFICIAL practice tests (previously administered exams from the Collegeboard) before doing the tests in your AP review books. Why waste your time doing imitator questions written by a third party when you can do actual AP exams? For each AP exam, there will probably be at least 5 released AP exams you can find online or buy. Ebay is one of the best places to look, as there is a guy who from time to time sells a compilation of 79 AP exams across every subject. Or you could get ripped off by the Collegeboard in their official store where they charge $25 per exam. Ask your teacher for exams first though. Some of the older exams, such as ones from the '80s and early '90s, aren’t even available on the Collegeboard’s store anymore, but are readily available online.</p>