Online You may schedule your test appointment using the online regesteration system at the official GMAT web-site at http://www.mba.com. You will be asked to check the seat availability at the test center of your preference and enter your data as well as payment details.
Using GMAT Information Bulletin If you choose to register for the GMAT by mail, fax or via phone, you will need to obtain the GMAT Information Bulletin which will give you all the details on the registration procedure.
Rescheduling, cancelation and refund
To view the rescheduling, canceling and refund regulations, refer to the GMAT Information Bulletin or http://www.mba.com.