Here is my story. Before taking the GMAT for the first time, I studied on my own for couple of months. I used the Official Guide and Kaplan books. I scored 480 with a perfect AWA score. My second time, I studied for one more month and scored 500 with a perfect AWA. Right now, I have about 6 months to prepare for the GMAT, but my budget is only around 200 to 300 dollars. So, basically, my goal is scoring above 650 and I would love it if you could let me know the most essential test prep materials to get this score. Also, one thing that really scares me is the statistics. I remember reading that only a few percentage of test takers get higher scores on their second, third and etc. tries. Please help.