B.Com

BBA is a good option. It is a job-oriented course.

In which college do you want to take admission for B.Com (Hons)?

Yes, you will definitely get admission as you belong to the OBC category.

Yes, if you have the ability to pursue both the courses simultaneously then go for it.

You can check link for NAAC A grade colleges: https://goo.gl/p5XYDX

You can approach various colleges for scholarship for MBA program after B.com.
Such as Amity
IBA, Bangalore
IIM A, etc

12th standard with commerce can take admission in the B.Com course.
It is the graduation level course. If you have above then 60% marks in 12th standard. then you can take admission in the famous college of India.
But many college take admission at the 50% marks or above in the 12th standard. If you want to take admission in the any college then contact the college for the eligibility criteria and more information or you can visit the official website of that college.
You can check the link: https://goo.gl/mtQyLo

There is lot of scope for B.Com:
1) CA
2) MBA
3) M.Com and then Ph.D.
4) CS.
5) Government jobs, banks, PSU, etc.
You can also go for research field after MBA by doing Ph.D.