MBBS in India

You should opt for B.Sc. You can opt for any subject in B.Sc.

To pursue MBBS in India is always more convenient in terms of education and economically. This degree is valid to be practiced in foreign countries later on, though for that you have to clear some tests.
All the best.

I suggest you to do MBBS in India and then opt for your Masters abroad as it is more convenient on economic as well as educational level.

Both B.Sc and MBBS are Bachelor's degree, so you pursue either of them. If you are planning for something in research, then the path is B.Sc and M.Sc or M.Tech. You need to decide first.

You need to qualify USLME to study further after MBBS or to work in the USA.

There are 3177 seats for 15% quota. Total government seats are approximately 24000 including private colleges, deemed universities, etc. There are more than 52000 seats in India. But, the admission depends upon your rank and state of domicile, etc.

It can range from Rs.30,000 per month for a doctor, who has just finished his MBBS to as high as Rs.2-3 lakh per day for highly accomplished super specialist.
An ex-professor of AIIMS had been offered around Rs.12 crore per annum from a big corporate hospital. That's almost Rs.3 lakh/day.
So, the salary of a doctor depends on his degree of specialization and the years of experience which he or she has.

YES THERE IS THE PROVISION FOR THE SAME

Maximum cost to do mbbs frm tamil nadu will be around 1 crore .that will also depend wether u r getting private mdeicla college or the government college . vadivel m sharing one link through which u will get to knw more about the mbbs from Tamil nadu nd their fees structures. http://timesofindia.indiatimes.com/home/education/news/MBBS-in-Tamil-Nadu-colleges-to-cost-up-to-Rs-1-crore/articleshow/36083413.cms go through it.