For those schools the GMAT score seems on the low side, but if your application is otherwise excellent, you'd have a shot, particularly at INSEAD, whose admissions process is more holistic (= focused on you as a person, not you as a collection of metrics). I agree with Rich, find an admissions specialist who could better assess that ... but assume that your score is something you'll at least have to explain.

The good news, at least in my experience, is that most students starting around 660 -- and by "starting", I mean "in possession of that score when I first see them" -- are capable of a 700+ in a reasonable amount of time. On average, successful students going from ≈660 to ≈700 take 2-4 months of 20+ hr/wk study, depending on how much you've done already. You can probably do a lot of this on your own, but be sure to focus on test taking strategy as much as anything else: knowing how to manage time, when to make educated (or even random) guesses, and how to improve your chances of getting something right when you aren't sure that you're right will have as much of an impact as further content study.