If you are registered for a test and want to change the test center, test date, or which test you registered to take, call us no later than the Wednesday that is two-and-a-half weeks before the test date. You must speak with a customer service representative:

When you call, be ready to tell the customer service representative your registration number and test date, your social security number, and the credit card number and expiration date.

Fees
There is a $19 fee to change your test, test date, or test center (plus any adjustments for the test fees). A Visa, MasterCard, American Express or Discover is required.