Great book. The first time I attempted the Gmat, I studied on the Cracking the GMAT and placed in 45th percentile in math. I bought this book and after a month of study, I went from 580 to 700 with 80% in quantitative. The problems are slightly different from the ones on the test but the difficulty is similar.
A very comprehensive and detailed guide.
If your Quant Skills are rustic and you have 3-4 weeks of time at hand. This is by far the most comprehensive and detailed book available. The best part about this book is its language and approach. The entire Quant section is broken down in a set of multiple chapters and it it's so much fun to work one chapter daily.
This book is basic, honest and offers a very enjoyable learning curve. It will help you to gradually develop your skill set by taking you through easy questions to tough one.
I strongly recommend this book to anyone out there who fears GMAT quant. You will enjoy this book and build a solid foundation. It's the simplicity and detail of this book that makes it so unique!!