If a person is already graduate, can he do graduation in one subject again, if yes, then in how many years ?

Dear Namrata, Yes you can do graduation in many subjects. If you are BA graduate then you can take again graduation in another subject, which is called additional BA . It is of 1 year duration. BA to BA is possible but not in another faculty like BA to B.com or BSc. Only in Similar faculty BSc-to

Yes it is possible.

Yes one can do graduation in other subject too even after doing in one.