Thanks for posting. To begin, a 700 is a strong score, and for top MBA programs it is the cut-off score admissions teams like to see. To answer your question, if you believe you can improve your GMAT score by 30+ points, we do recommend you take 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 GMAT again.
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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