| Well I took the class in school and have not gotten my score back yet so I can't really talk. However, from my experience, Barrons is the best source for information (though it gives a lot more info than is needed) but the practice questions are not that great. The princeton review prqactice questions are the hardest I ever did but they are good for the whole Change over time concept. I would also review all the Free response questions from previous years and look at how they were graded. (collegeboard.com). Finally, the 2002 and 2007 multiple choice portions are now available from collegeboard for practice. hope this helps. | 
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