Hello, Mayank Rathore

You can always do additional courses after your graduation or post graduation. It is an asset to your profile. After your B.Sc, you can do an additional program, B.A in any subject that interests you for an year but it won't be a regular degree since a regular degree involves two or three year program. It is called an associate degree. If you want to do the course, you need to have a score of minimum of 50% in that particular subject in your 12th standard. 

Hope this helps you!