<p>I first suggest picking one AP class to focus on and prepare for that, take the test and see how you do. Amazon has book reviews and you can look at those to see what other students had to say about the review book’s helpfulness. These books are vital because they will tell you exactly how the tests are constructed and how you should study for them. AP classes are taught differently from other classes - stressing certain ways of looking at information, writing essays, etc… You need to become familiar with that.</p>