Given the information that you provide, I would say that your GMAT scores are on the low side for INSEAD, UCLA, ISB and ROSS. However, for most of the schools the 660 score is borderline for most of these schools -- and if you really want to go to one of these schools, you should definitely apply. However, you have to make sure that your essays, recommendations, interviews, etc. are all top notch.
As for schools that are slightly less competitive, like Ohio State and SMU, I would say that your chances of admissions are quite high. However, there is a pretty big difference between your dream schools and your back-up schools and we encourage you to investigate other options.
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