Make sure you’re studying with the most up-to-date prep materials! Look for The Princeton Review’s MCAT Psychology and Sociology Review, 3rd Edition ( 9780525567639, on-sale December 2018).
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I used The Princeton Review books + prep course wen studying for my MCAT and supplemented with the Kaplan review books and questions. I tended to prefer The Princeton Review over the Kaplan books, but the additional questions were worth it. Not enjoyable - but useful. The test taking strategies in the CARS books are the most useful of all the review books - for the other section, any content review will likely suffice, but CARS is very test strategy dependent.