As a nontraditional student (I majored in psychology before deciding to attempt medical school), I haven't taken many of the undergraduate biology courses that cover material on the MCAT. AMCAS claims that an intro to biology is all that's covered, but I took all of their practice tests, as well as a real one, and know better. There's a surprising amount of biochemical and physiological terminology that you're expected to understand, even though it may not be tested in great detail. Honestly, I doubt I would have scored a 10 without this book (just for reference, my scores were: 12V, 11P, 10B, and a Q in writing). While a 10 may not seem very high, I scored an 8 and 9 on two practice tests, read through this book three times (as the author recommends), and consistently scored 11-12 on the remaining practice exams.
My only recommendation is to buy a useful organic chemistry book. Unfortunately, I took organic right before the MCAT so I didn't bother studying, thinking I was ready (so I don't have any studying recommendations for that subject). I'm fairly certain this oversight is what prevented me from scoring higher than a 10.