Research MBA Programs

Dear Experts,

I am preparing for gmat for quite a long time now & i want to go for it but not sure about my chances to get into my dream schools - Cornell, UCLA, Darden, INSEAD/NUS.

I have started slow preparation from GMAT prep & then start with OG n other practice materials.Am i going right?

Also can you please evaluate & comment on my summarized profile for chances?

% marks in 10/12/Engg. - 60/70/80.
Total IT experience - 6.5 years (3 years at US & Europe)
Achievements - Applause awards, schorlarships & Client awards.
ECA - school level Quiz, foreign language, NGO, Teaching.

Please evaluate & suggestions are always welcome. What GMAT score should i target?

Thanks a lot for your precious time & energy.

OG is where you want to focus for practice problems, but there are other texts that are better for learning how to do the problems. Happy to talk with you about those.

As for GMAT score, do some research on 80% range for each school and shoot for the high end of that range.