I heard that the GMAT Prep score is very close to your final score. I have been studying GMAT for about a week and took the two Prep Tests. Supprisingly, the scores are the same: boh are 640. I will take the test this Tuesday. We will see how close it can be. My goal for GMAT is very very low. I only need a score of 500. Don't know how many incorrect choices I can afford to lose.