MBBS

Yes you can pursue MBBS even after having a 3 years gap in education. But you have to appear the common entrance examination- NEET. And also make sure that you fulfil all the eligibility criterias.
Hope this helps

No, you cannot get admission in any college college for MBBS with this score.

Yes, you can do MBBS without qualifying NEET but from next year you won't be able to do so.

Yes, you will get an admission for MBBS after 3 years gap from 12th standard but not exceeding the age limit of NEET examination. The upper age limit is 25 years and five years extra for SC / ST. Please check the age limit with current nomination of NEET.

Yes, you are eligible because the eligibility criteria is only PCB 50% in 12th.

Hi Saeed,
Chances are very good. He must also take the IELTS to meet English language requirements. Though SAT or ACT is not mandatory I will encourage your brother to take the SAT or ACT for better chances. Check here
http://www.future.utoronto.ca/apply/requirements/international-high-school-seconda

Yes, you have a very good chance for getting it. You are expected to get it through your state level counseling.
All the best. Feel free to revert.

Hi Dear,
You have to appear the All India Common Entrance Examination or NEET to get admission into MBBS or BDS in India. There's no other gateway for admission.