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Target Test Prep gives you practice problems with every possible quant question type you would see on the GMAT. I would review Kaplan's question banks but I never really learned the material because, it was all new problems without clear direction as to how to solve the problem. The Target Test Prep videos show you how to solve every single question that would be in the question bank. It is the best Quant review.

I took the Kaplan course(waste) in May, and my score only improved from 680 on my diagnostic to a 710 on my last practice test. So I signed up for Target Test prep four weeks before I took the exam, and did a chapter and 2 quizzes for that chapter per day. I ended up with a 750 4 weeks after signing up for Target test prep. It is the BEST quant review. Highly recommend.