Hi saurav171,
The process of applying to (and ultimately attending) Business School will require a big investment of time, money and energy on your part, so you really should make sure that the Programs that you apply to match your career goals/needs. There are a variety of factors that go into selecting the Schools that you'll apply to. Instead of just applying to Programs in which you might have a good chance to 'get in', here are some other things to think about:
1) Is there a particular company that you want to work for or industry that you want to work in? Certain degrees are more appropriate than others if you have a specific career goal.
2) What do you want your MBA to do for you?
3) Do you want to go to School full-time or part-time?
4) Are you willing to relocate? Are you comfortable with working through a program that is primarily online?
5) Are you going to be applying for scholarships?
Etc.
It sounds like you already have some idea as to the type of Program that you're looking for, so I suggest that you start 'Googling' some of these ideas and do some research. Once you have a list of Schools that match your needs, you can then get a better sense of the type of GMAT score that you would need to be a competitive applicant and the application deadlines that exist. Once you have those numbers in mind, we can then define your score goal and talk about how best to study going forward.
GMAT assassins aren't born, they're made,
Rich