To raise your score, you can retake the GMAT up to five times during a calendar year. If you want to attend a top-tier school, a high GMAT score can boost your chances. However, you may not need a high score. Research the average GMAT scores for the students at your chosen business schools. Your score may compare favorably to some of them. If not, consider schools that don't require the GMAT or will consider a GMAT waiver.