How to Register for the GMAT
You can register online for the GMAT at mba.com. The cost—or "appointment fee"–to take the exam is currently $250. The Graduate Management Admissions Council (GMAC) takes personal checks, money orders, and most major credit cards.
If you're re-taking the GMAT, just follow the same procedures. However, keep in mind that you are not allowed to take the GMAT more than once in any 31-day period.