If you're going to take a prep course: Princeton Review vs. Kaplan

[PizzaButt]

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Which is better for the GRE? When I took the MCAT, I took Kaplan, because I thought they had more extensive online materials (and a library of practice tests).

What are your thoughts about taking a prep course? I'm thinking I might do better with one, as I haven't touched math since 12th grade.