Hi Gauri10,
You've named some highly competitive Schools, so beyond having a strong GMAT score, you need a strong OVERALL profile AND you need to 'market yourself' correctly to each individual School that you plan to apply to. You would likely find it beneficial to speak with an Admissions Expert about your overall profile. There's a Forum full of them here:
ask-admission-consultants-124/Unfortunately, until you have an Official GMAT score 'locked up', there is no way to tell you what your chances are of getting accepted to any specific School.
As far as your continued studies are concerned, you would likely find it beneficial to invest in a GMAT Course that better matches your sensibilities (either Guided Self-Study or instructor-led). Most GMAT Companies offer some type of free materials (practice problems, Trial Accounts, videos, etc.) that you can use to 'test out' a product before you buy it. We have a variety of those resources at our site (
www.empowergmat.com). I suggest that you take advantage of all of them then choose the one that best matches your personality, timeline and budget.
If you have any additional question, then just let me know.
GMAT assassins aren't born, they're made,
Rich