<p>I used to be a die-hard Barron's user, but then I started really enjoying Princeton Review when I used it for ACT and SAT prep. I'm taking the following AP tests in May: European History, Psychology, English Literature & Composition, and Macroeconomics. I already have the Barron's book for Euro because it's a required class supplement. Any suggestions as to which particular prep books go well with each course? (If it helps, I far prefer a straight-forward learning approach and am very much a visual learner.)</p>