On chances with top MBA schools

Hi guys. Wanted to get your thoughts on a couple of things. Quick intro about myself: I'm 27 years old, have worked for almost 8 years now (from an emerging Asian country). Worked as strategy manager for a telecommunications company, headed an acquisition sales team in a financial services " start up" (mobile banking model), and now with doing customer marketing for another financial services company (money transfers / remittance business). I am a communications graduate (without any accounting, finance, or hard math background), I learned everything on the job. I'm thinking of applying for an MBA in top business schools, though I know the competition will be cut throat among the applicants from the same profile. (Pending GRE / GMAT, with worries on the math part given my background), What do you think are the chances of getting into top business schools? Do you have any reco on what MBA school will be the best option (with the highest chance of admission) given my background? How do you think could I make up for a less than 700 gmat score (assuming the worst case). Appreciate all your insights in advance.