别急别急, 这里是他们官方的解释, 说是可以写信申请多考的。 可以试试How soon can I retake the GMAT?
You can retake the GMAT up to 5 times in any 12-month period, but no more than once in any 16-day period. You can request to GMAC in writing if you want to take it more than that, but applications are only considered after you have actually taken the 5th test.