Hi parmeet singh,
Are you currently still in School or have you already graduated? I ask because certain Schools will allow you to retake classes (so that you can improve your grade and GPA). You could also take new classes (as part of an 'Extension' Program) - if you were to earn high grades in classes that Business Schools find relevant (such as Calculus or Statistics), then you might also be able to improve your overall profile.
Since you've named some highly competitive Schools, you really have to make sure that every aspect of your profile is as strong as you can make it. If you can't improve your GPA, then you should try to improve the other aspects of your application (so that those aspects overcompensate for your GPA).
You might also want to post your questions to the Admissions Experts in their Forum:
https://www.beatthegmat.com/ask-an-mba-a ... t-f40.html
GMAT assassins aren't born, they're made,
Rich