Jeff Sackmann, author of "Total GMAT Math", "Total GMAT Verbal", and "GMAT 111: Tricks, Tips, and Tactics" has been helping students prepare for the GMAT and apply to business school since 2000. In his books, Jeff focuses on two things: building solid content knowledge and providing extremely realistic practice material. Unlike many other resources on the market, his practice problems are virtually indistinguishable from the real thing, ensuring you are much more prepared for the GMAT before you sit for the exam.