Could this be used as a end-all in math review for the GMAT? I don't have the money to buy those expensive Manhattan guides and this book seems like a bargain. It might not have probabilty in it but my GMAT for dummies book that I got at the library has that section covered.
Why spend the money? Get on this web site and go through the questions, reviews, etc.. Trust me, you will learn plenty from this web site.