Naveen,
It's difficult to give a truly accurate assessment based on the limited information that you have provided. Although the education system is different in India, I know that you can come up with some estimate of GPA/rank. The caliber of your university and academic and extracurricular accomplishments will be important. However, numbers and resume are a mere starting point for this process; strong recommendations, essays, and interview are essential. In your application you will need to go far beyond your resume to provide insights into who you are as a person, what are your goals, passions, involvements. All of this will be factored into your admissions decisions. That said, you wrote "top 100 schools". If you meant 100 and not 10, I can tell you that YES, you have a 99% chance of being admitted. Finally, one thing that stood out to me in your email is that you seem to have progressed nicely within your current company. That progression is critical and will help a lot with your application. Since it has been 2 years since your past promotion, if you can squeeze in one more before you apply, even better.
Good luck!
Stacy

Recommendations should almost always be from your employer. Ideally, you will have one letter from your direct supervisor, and then another from someone who can provide a different perspective - perhaps someone that you work with cross functionally.

The key to extracurriculars is that they demonstrate leadership, and show that you are a well rounded, involved person with diverse interests. Quality of the involvement is more important than quantity. You do not want to suspiciously become involved with something out of the blue just months before applying. Make sure that whatever you do is somehow linked to your genuine interests and prior activities. For example, if you enjoy painting, perhaps you can teach an art class to children in a low income neighborhood. If you were on the swim team in high school, you can coach a high school swim team now. There are infinite possibilities for extracurricular involvements. Make it something that you genuinely enjoy and you will thrive. An activity where you can demonstrate leadership and take initiative will be much more valuable than a half-hearted involvement.

Also with regards to volunteer work - you may want to read yesterday's post on my blog. Jeremy Dann, one of our consultants, outlined some ideas related to community service.
https://blog.stacyblackman.com/?p=53