Hi ashishthanga,
In a recent post, you implied that you would not be applying to School for another 2-3 years. This gives you lots of potential time to strengthen a number of different aspects of your profile. With highly-competitive Schools such as Stanford, you will need a high GMAT Score along with a strong OVERALL profile AND you will need to properly 'market yourself' to each individual Program that you apply to.
You're ultimately asking Admissions questions, so you would likely find it beneficial to speak with an Admissions Expert about your overall profile and plans. Those Experts should be able to answer your Admissions questions and help define the specific areas of your profile that could use some improvement. There's a Forum full of those Experts here:
https://gmatclub.com/forum/ask-admissio ... tants-124/GMAT assassins aren't born, they're made,
Rich