If you plan on re-taking, you should plan on altering your prep strategy drastically. The best way to increase your score is to approach the material differently. I tried it on my own & did okay, but in just 2 weeks working at Kaplan, I already think I'll do better in August. I couldn't afford the test prep course last time (really I can't now), but it really is a great way to prepare. Remember, the material is secondary -- they want to test how you think, and learning the rules of the game is an important part of doing well.