Navigate to the Prometric website to reschedule a computer-based GRE exam. Select "GRE" from the Academic, Professional, Government & Corporate" drop-down menu.
Click the "Start" button in the "Getting Started" text box and select the country where you planned on taking the test. Click "Register Online for the Computer-based General Test" and then select the state (if necessary) where you planned to take your test. Click "Next."
Click the "Reschedule or Cancel an Exam" link. Type your "Confirmation/Tracking Number" and the first four letters of your last name in the appropriate fields and click "Next."
Reschedule to a different testing date or location. You cannot reschedule among different testing regions. Have your credit card handy because you will also need to pay the $50 rescheduling fee as of 2010. Click "OK" to reschedule your GRE exam.
Change a paper-based GRE exam by writing to the GRE testing center at:
GRE-ETS
PO Box 6000
Princeton, NJ 08541-6000
Include your name, birth date and mailing address in the letter. Also include the prior registration number and test date, then indicate your preferred test center and the date you would like to take the exam. You will also be subject to a $50 rescheduling fee as of 2010.
Send your correspondence. It must be received by ETS three days prior to your exam.