Registering for the GMAT is fairly straightforward. Although you can register by mail or over the telephone, the easiest way to register for the test is online at the GMAT website. The current registration fee is $250, which is most easily paid by credit card, although the test maker will also accept money orders, certified checks, and personal checks.
An important note about registering for the GMAT: you may only register for the test once every 30 days, up to 5 times per 12 month period. But be aware that taking the GMAT several times and hoping to get lucky is a very bad idea, as most graduate business schools take the average of all your scores, and not the top score. Therefore, you are much better off being very well prepared before taking the test, taking the test only once, and achieving a high score.
To be directed to the official GMAT registration website, click here.