Haneef, to be eligible for becoming a Doctor, you should have studied in Science stream. You should have completed your 12th with Physics, Chemistry, Biology and English as core subjects. You can take up Biology as an additional subject but the rest of the subjects are supposed to be core subjects mandatorily. Now with Commerce as your stream, it is highly unlikely that you will have these subjects and so unfortunately you do not qualify for NEET which is the entrance exam for admission to Medical, Dental, Ayush and Veterinary courses across India. Or the other way is repeating your 12th from NIOS with Physics, Chemistry, Biology and English as core subbjects.