Hii,

If you are talking about medical,

First You should have your MBBS degree from a recognised College NMC approved this is a basic criteria.

After that you must have you 1 year internship after MBBS.

Must qualify NEET PG exam that is a postgraduate exam . now based on your rank you have to go through councelling via All India quota or state quota .

You can choose MS, MD in government or private college based on your choice .

So if your rank is not high so you can stil get admission , but with higher fees like it's too costly to pay for md course in private.