Thanks for posting, and congratulations on improving your GMAT score thus far. If you are aiming for a top 10 MBA program, I do recommend you look to take the GMAT again. The reason is that your highest score is self-reported on your application, so admissions teams will be focused on your best score. There isn't a downside to taking the test again, and top programs do like to see a score above a 700.
If you decide to take the test again, here are some free GMAT tips: http://www.stacyblackman.com/gmat-overview/
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