You may take the GMAT® exam once every 31 calendar days and no more than five (5) times in a rolling 12-month period. If you score an 800 on the exam, you will be prohibited from testing for five (5) years from your exam date.
CONFIRMATION OF GMAT APPOINTMENT上说:You may reschedule or cancel your appointment at any time. However, keep in mind that the following costs may apply based on when you reschedule or cancel.