1. Improve your class rank. If you stay at the 50th percentile for the next three years, you will find it very difficult to match.
2. Get a good score on the CBSE. You should aim for at least 65, preferably 70+.
3. Accept that even if you do 1 and 2, there’s still a good chance you’ll have to do an intern year. Many people, including candidates with impeccable academics, fail to match the first time around and do an intern year. It’s not easy to match, even with excellent credentials. There’s no shame in doing an intern year to improve your application.
4. Find some time to do a few externships over the next couple years. It will give you a better understanding of what to expect in residency, and programs won’t take you seriously if you haven’t done any externships or at least spent time shadowing at your home program.