Hi 2018Aspirant,
First off, a 650 is a strong score (it's right around 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. You have listed some highly-competitive Schools though, so you would likely find it beneficial to speak with an Admissions Expert about your overall profile. There's a Forum full of them here:
https://gmatclub.com/forum/ask-admission ... tants-124/If you do choose to retest, then it would help to know a bit more about this score and how you studied:
1) What were your Quant and Verbal Scaled Scores for this 650?
2) How long have you studied?
3) What materials have you used?
4) How have you scored on each of your CATs (including the Quant and Verbal Scaled Scores)?
GMAT assassins aren't born, they're made,
Rich