Thanks for your post. Regarding your GMAT, I do want to mention that your highest school is self-reported on your business school application. This means that an admissions team will focus on your best score. If you do feel you can improve your score by 30+ points, there is no harm in taking the test again.
Improving your score by 30+ points will have an impact with top MBA programs, as they do like to see a score above a 700. If you decide to take the exam again, we provide free GMAT tips here: http://www.stacyblackman.com/gmat-files/
We also provide free 30 minute phone consultations here: http://www.stacyblackman.com/contact/
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