Hi Raphael,
Thanks for writing in. I think your overall GMAT is around the right place for the schools you mention, but I agree that ideally your Quant part would be higher in order to combat any fear over your college transcript. The best tool to fight your GPA/Quant score is a short optional essay that explains how you have been successful with analytics in your job and use advanced quant skills every day, and you believe that is more indicative of your true performance.
Your GMAT is not terribly unbalanced in my opinion, but if you decide to retake the exam you'll want to aim to clear the 80% mark on both sections. The Cambridge GPA requirement also allows for "top 25% of class." Does that apply to you?
Since Cambridge is rare in that it sets such clear minimum thresholds, I suggest you address them head-on via your essays. Explain why you think these scores are not indicative of your true performance, and point to other qualities you would bring to campus (ie leadership).
As for retaking the GMAT, if your practice attempts indicate that an 80%/80% score is feasible, you may want to invest the time to retake given that you are looking at very competitive schools.
Best of luck!
Daniel Richards
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