Can I cancel my scores?
Yes. You can cancel your scores immediately after you take the GRE. This is the only time you can cancel your scores.
Unfortunately, you must make the decision to cancel at the testing center before you see your scores. In addition, the fact that you cancelled your scores will be noted on your official GRE score report.
Think Very Carefully Before Doing Anything
Before you cancel your score or quit the exam, ask yourself whether you are sure this is what you really want to do. It has been our experience that most test takers who cancel their scores or quit the exam do so irrationally. You probably know from your previous test experiences that you often turn out to have done better on an exam than you thought you would while you were taking it.