Hi nickcab,
First off, a 660 is a strong score (it's just above the 80th percentile overall), so it could be enough to get you into your first-choice School. As such, a retest might not be necessary. Depending on the Schools that you plan to apply to, you would likely find it beneficial to speak with an Admissions Expert about your overall profile. There's a Forum full of them here:
http://gmatclub.com/forum/ask-admission
...
First off, a 660 is a strong score (it's just above the 80th percentile overall), so it could be enough to get you into your first-choice School. As such, a retest might not be necessary. Depending on the Schools that you plan to apply to, you would likely find it beneficial to speak with an Admissions Expert about your overall profile. There's a Forum full of them here:
http://gmatclub.com/forum/ask-admission
...
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