Thanks for posting. With the GMAT, have you considered taking the exam again? The reason is on your business school application, your highest score is self-reported on your application, so admissions teams will focus on your highest score. There is no harm in taking the exam again.
If you are able to improve your score to a 700, I believe it would have a big impact on your application. If you'd like, MBA.com provides 2 free official GMAT practice exams.
We also have free GMAT tips here: http://www.stacyblackman.com/gmat-files/
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