You did not mention your score on the exams.  If you have a field of interest and you want to pursue it, then do what interests you.  If your score was not high in the MBA  examination, then it might tell you something.  Was there an area where you were weak, like Mathematics, or Biology?  If you did not do well, were you prepared or did you need some tutoring?  Only you know what you want to do with your life, and only you can answer these questions.  Remember that what you decide will affect the quality of the rest of your life.  Take some time, talk to some professors or counselors and get the opinion of people who have taken these exams and are now doing the work.  If you don’t want to talk one on one, then there are web sites where you can post, and others will answer you.   If you were unprepared for your exams, it is not a terrible thing to take them again, if this would satisfy you.  Many people take the exam twice because a score in the 90’s is needed to get the best jobs.  If you already took the MBA entrance exam, how would taking the other test help you?  You must ask yourself, not only this question, but an even more difficult one.  Where do you see yourself in five years?  What would you want to be doing with your life, at that time?