I think you may need to consider retaking the GMAT. I would not be as concerned about the average score at ISB but the 80% range. Your score is below the 80% range which puts your application at considerably higher risk than someone who is hitting, say, a 700 GMAT. Granted your work history is in consulting which will come across as more valuable in the b-school classroom than if you had stuck with your computer science education, and the fact you went to school in the US will also be a differentiator, but if you think you can study and pull off a 700, you would be adding some valuable insurance to your profile in my view. I think you can make it in on your current profile, it just lowers your percentages by doing so with the 670. There are simply too many applicants with similar backgrounds but better numbers.
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