Now that NEET PG has been scrapped, you have to qualify in NEXT and based on your merit, you can choose MS/MD Cardiology to become a Cardiologist in India. Post MD, you can also pursue 3 year DM for Super Speciality in Cardiology . Or you can also go abroad to pursue MS. Private Hospitals start with anything from 20,000Rs based on the location that you are working in.