Please do not call it quits and pursue only your GMAT studies. I know the test is difficult and intimidating, but admissions considers your current work position as an indicator of your professional abilities and potential. Also, if you quit your job and only focus on your GMAT, it may send the message that you can only focus on one big aspect of your life at a time -- and business school is so demanding that you have to be an expert day one at multi-tasking. Lastly, remember that your application is multi-faceted - not just a standardized test so you have to continue to develop as many aspects of this test as you can.
So, consider the following:
* taking a leave of absence
* taking all of your vacation and sick time to dedicate to the exam
* getting a tutor who will work with you extensively on problematic aspects of your exam
* forming a serious study group that meets a few times a week
* working with an admissions consultant or coach who can keep you on schedule and focused
* getting a new job that is much less demanding (for instance, if you work in investment banking, consider getting a job in the government or at some sort of not for profit).
Kimberly Plaga
Senior Admissions Consultant
Manhattan Review