juco @ 2011-03-06

Fractions, Decimals, & Percents GMAT Preparation Guide, 4th Edition (Manhattan GMAT Preparation Guides)

$9.99

This book covers well the concepts and has several advanced exercises of this part of the Gmat. Buying the book, you will have access to 6 online GMAT tests. The online tests are really good and come with detail explanations. The level of the questions in the online exams is higher than in the real exam.