How to Cancel or Challenge Your GMAT Score
After you finish your test, the CAT will provide you an option either to cancel your GMAT score or to view it. If you feel like you could have performed better and your score will not be what you'd like it to be, you can cancel your score. In case you choose to cancel your score, all your scores (AWA, Quantitative, and Verbal) will be cancelled. If you choose to view it, you will see your unofficial GMAT score (without AWA). After you have chosen to see your score you will not be able to cancel it. Regardless of your decision, you will not be able to retake the GMAT for 31 calendar days.
As for challenging your GMAT score, you may not have your entire exam rescored even if you disagree with your result. However, you can ask to rescore your AWA. For this, you will have to submit a GMAT Exam Essay Rescore Request Form, which you can find at mba.com, and pay an additional fee of $45. This fee will not be refunded to you. It usually takes no longer than 3 weeks to rescore your essays, and if the AWA score changes (becomes lower or higher) your new score will be reported to all the schools to which your initial score was submitted.
In addition, you may contact GMAT customer service if you think that a certain question was not valid. After your request is processed, you will be notified of the decision. If it affects your overall GMAT score, your new score will be reported to all schools to which your initial score was submitted.
You can request a rescore of your AWA or challenge a certain question only within 6 months from the day your official GMAT score was issued.