I bought the book several months ago, and took the test last month, and I thought it DEFINITELY helped. If nothing else, it gives you and idea of what KIND of math questions there will be. Also, on the reading comprehension, the practice tests let you know what areas you're having more difficulty (for instance, I got more "what is the main idea of this paragraph" questions wrong than any other type, so I really did extra studying on that area.
Anyway, I highly recommend it.
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