Do you need the GMAT for an MS Degree? It may be particular for your program but usually a master's degree does not require the GMAT Exam. Only the MBA does - and it seems you already have your MBA?
GMAT score averages at Harvard/Insead are easily over 700 - the exact figure is usually between 710-720. But there are certainly applicants who have scores in the 600s that get in - they will usually have a pretty impressive business background.
Typically to boost your score to 800 - it's really about precision. You already got 710 - it's a tweak of finding the right types of problems that would bring you down and spending a few weeks to nail everything down. Then you have to execute on the actual exam day. I would recommend at least 2 wks - preferably 1 month of studying on wkends/evenings.
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Zeke Lee, GMAT Pill Study Method (Study Less. Score More.) | Download Ebook
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