The best prep course you can take

Three years ago I took the Princeton review class and this one is better by 1,000x. They focus on the important elements that can actually improve your score and teach you logic as opposed to memorization. For example, the first time I took the test post-Princeton review I was so worried about memorizing math formulas and idioms that I felt overwhelmed and didn't focus on the right things. With Manhattan GMAT, they teach you the reasoning behind formulas (so you can logically recall as opposed to memorize) and don't get caught up on details (like odd idioms) that could maybe come up on 1 question of the whole test.

Overall, the instructor quality and availability was excellent. Also, the online tools of MGMAT really are differentiating and helpful (aka assessment reports).

I would only recommend MGMAT to people in the future.