Think like the GMAT test makers
I have nothing but good things to say about everyone @ Sherpa. I don't even understand how companies such as Kaplan, ManhattanGMAT, and etc. are in business with Sherpa existing in the GMAT test prep space. I've taken GMAT classes from many big-name test prep companies... and there is no comparison to the value Sherpa provides. Tactics and shortcuts are not enough! If you want to ace the GMAT, you need to understand how the test makers think. And Sherpa is the only company I've seen so far that educates you to that level.