This is a college project done by me and my colleagues for our research project aka RP in our college. I was going across many sites searching for the top companies and what makes them come to the top and then I ended my search here http://www.dnb.co.in/India'sTop500Companies/default.html. Dun and Bradstreet have been listing top 500 companies for the last 15 years and the data they have is very comprehensive,it was really helpful for me.
I hope this will help others who are doing their project on a similar topic.