Which book to buy after the Official Guide?

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I've completed all of the Official Guide problems, and I am wondering which book is best to buy next. I already have the Princeton Review's "1,037 Practice Questions for the New GMAT" and have completed almost all of the quantitative problems; however, I have found that there are tons of typos in both the problems and answer key. Plus, I have heard that the Official Guide supplements are better materials. Would you recommend that I:

1) Purchase the GMAT Official Guide's Quantitative and Verbal books (with 300 questions each)
2) Continue with the Princeton Review 1,037 Practice
3) Consider Manhattan GMAT materials

I am only 28 days away from the test, so pick the top book only please.
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by tutorphd » Fri Jul 27, 2012 8:17 pm
Below I address only the quant guides. I don't tutor verbal and can't offer advice there.

Princeton Review is actually the prep company that offers problems that are the closest in style to the official ones.

The Quantitative Review guide is worth getting because it contains official problems and complements the Official Guide. You can also get the Problem Pack I for the free GMATPrep software - also official problems of various difficulty.

If you buy a MGMAT guide, you get 1 year access to their CAT's which are very good in quant - I hear they are too easy in verbal. The quant MGMAT guides are worth for the theory explanation in them but the problems in them suck. They are just warm up problems, not close in style to the official ones, and not sufficient in number.
Skype / Chicago quant tutor in GMAT / GRE
https://gmat.tutorchicago.org/