Manhattan GMAT: best GMAT prep materials

To prepare for my GMAT, I used a variety of prep materials from GMAC, Manhattan Prep and other prep companies. I like the Manhattan GMAT series a lot for its focus on concepts. The explanations have sufficient substance to help learners grasp the concepts behind the questions. Other companies seem to lean towards elimination tricks, which work well for questions up to the 700 level but not beyond.

I have also found that the Manhattan GMAT series does not contain any serious typological mistakes, while than some books by other companies repeatedly contain frustrating typos. This is a small matter that can cause a lot of confusion to learners, especially in a timed testing environment. Manhattan GMAT's attention to detail makes a difference.

I attended two very workshops in Singapore conducted by Robert Wilburn. Those workshops helped me consolidate and further enhance things I had learned by that point.