Cracking the new GMAT - Geoff Martz

If you need to know it for the next-generation GMAT, it's in this book.
Cracking the New GMAT, 2013 Edition has been completely revised and updated for the changes coming to the new GMAT in June 2012. It includes:

Access to 2 full-length practice tests
Tons of sample problems and drills in the book covering all 4 GMAT sections, plus more extra practice on the companion web site
Step-by-step instruction on the new GMAT question types: table analysis, graphics interpretation, multi-source reasoning, and two-part analysis
Thorough review of all tested topics, including data sufficiency, arithmetic, algebra, geometry, sentence correction, reading comprehension, critical reasoning, and more