AP Calculus (Princeton Review, Kaplan, Barron's)

I recently have used all Princeton Review, Barron's and Kaplan AP Calculus prep books and Borron's had many challenging problems unlike other two that had mostly easy problems. So I would recommend Barron's for AP Calculus if you are preparing for BC. And use other two if you are preparing AB.

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http://amzn.to/1eWi9Dd    (Barron's) $13.26
http://amzn.to/MulBhd  (Princeton Review) $15.87
http://amzn.to/1kfpS6z (Kaplan) $16.37