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"Well, most of them are in that picture, and they tend to be one of Three series Workbooks for Dummies, the Big Fat Notebook series, and ap. AP Review Books from the Princeton Review, who also makes the test for ap. The idea is to kind of work through some of the simple. The ideas that are simpler for me, work through the ideas from text that explain them simply and also get some practice working through problems ahead of time."