The B-School Application | Ways to improve profile to get in B school?

I am a mechanical graduate and have low GPA. I am going to join marketing industry(looking for opportunity, preferably technical marketing, soft excluded).
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1. How can i make my profile better to get in good business school(marketing), if i am planning to get work exp of 3 years?
I want to cover my negative points(i.e low GPA) in these 3 years.
2. Best Schools for marketing for me(matching to my profile) in india and abrod.
3. 3 years will be investment for business school admission. So,
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