How well would I be prepared for the AP Bio test if I knew a review book inside-and-out?

Okay, so obviously it's getting crunch time. The AP exams are in a month. I am taking the AP Bio exam. I have a review book for it. I'm talking about Princeton Review, Barron's review type thing, not my humongous textbook. At this point I'm thinking the review is what I need to focus on. It seems like it covers all of the stuff you actually need to know. Is this true, or should I study my big textbook? If I study the review book really hard, and know the material in it really really well, how can I expect to do on the AP exam? Basically I want to know how I should study. Any suggestions are welcome.