What book should I use for AP sciences?

<p>I'm planning to take Biology, Chemistry, and Physics AP exams next year...
I have to buy the books this Summer to start prepare for the exam.
What book should I buy for Bio, Chem, and Physics?</p>

<p>The books I know are Princeton Review, Barron's, Kaplan, 5 steps to a 5...</p>

<p>use prep books only to review the material you already know.</p>

<p>a decent textbook for AP Chem is “Chemical Principles” by Zumdahl</p>

<p>People say Barron’s cover too much details for chem…
How about Biology? And how about ‘5 steps to a 5?’</p>