I studied for the GMAT off and on for about 8 months. When I really started to focus on sticking to a schedule I worked with another prep company for Quant. While the material was excellent I must admit it was lacking in the strategy game. I was lucky to get free access to Empower materials for a month. After following their strategies for Quant and Verbal I was able to see my CAT scores jump from about 600 on average to a final test day score of 700. I credit Empower GMAT with helping me get that 100-point boost! GMAT is not always about how much you know! Knowing how to play the game is also very important. I highly endorse this product to anyone looking to boost their scores.