Hey Kate,
I'm facing a similar predicament with my 760 while targeting Wharton, Booth, LBS, & Ross. So far, everyone's advised me against re-taking it!
In your experience, have you seen anyone improving either their chances of acceptance or the size of their financial aid package by improving within the 99th %ile?
Like the OP, I'm an Indian male engineer too, except that I have the added burden of a no-name college and a low-ish GPA(We have a % scale so I'm not sure about the conversion).
EDIT: Could I also make my case for acceptance/financial aid stronger by finishing a few graded courses through a medium like Coursera? If so, would you know which subjects would have the greatest impact? I'm already strong in finance and accounting and shouldn't have any problems getting a high grade if the need arises.
Regards,
Vignesh