IGNOU - Indira Gandhi National Open University

Generally Universities do not allow migration from a distance learning program to a regular degree course.

Yes, IGNOU is there.
IGNOU is better as compared to SMU, as Sikkim Manipal University is under various controversy like expiry of UGC approval and Franchisee of Education system, which is not allowed. Degree is only valid when university follow UGC regulation, but SMU never follows according to UGC. No private University conduct examination outside its campus and appoint Franchisee.

Hello Santosh,
IGNOU allows you to do BA in as many subjects as you want. It is really good to see your enthusiasm in studying different subjects.

Hello Manoj,
It's very heartening to know your quest to learn more in shortest possible time. Yes, you can do both these simultaneously in IGNOU. But only if you can study for both.
Best wishes.