I had done no preparation and went into this class completely blind. I feel that was a good decision because the GMAT is all about strategy. You can study certain topics until you have them memorized, but without the Kaplan quick tricks you will waste time during the test and be generally inefficient in your efforts. This class was wonderful and helped me get to a place where I could do independent study/practice to boost my score those last couple points I needed to reach my goal.