GMAT help: a chance to get into top universities...

I am from India and I finished my graduation (15 years of education) in 2001. From 2001 I have been working in various Engineering Colleges and Educational Institutes training students in Quantitative Aptitude skills. I want to take GMAT the next year. DO u think that I stand a chance to get into top universities (provided i get a good score) with a work experience(of 6-7 years) like this?