MBBS

Getting an entrance is important. if you have some other option, please write it. Else you should take this college.

If you want to study in West Bengal, you have to prepare well & try for better institutes next year because you must score a rank under 2000 if you want a good medical college there since the private medical institutes in West Bengal are not good for studies.

Some of the best options include:
Sun Yat Sen University
Zheijiang University
Huazhong University
Beihua University
Jilin University
China Medical University
These are the best options for MBBS, you need to spend around 25 L to 32 L there.

MBBS is a six year program in UK which comprises of Foundation and Specialty Training. For science students, the duration could be of five years. Tuition fee is around British Pound 20,000 to British Pound 37,100 for international students. Living is expensive in UK and will largely depend on your l

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

According to me, you should opt for M.Sc as you have opted B.Sc in UG.

Yes, you can take admission in MBBS after completing class 12th or after completing your graduation, but there is no advantage of doing B. Pharma, and then MBBS. Neither your experience nor your degree of B.Pharm will have worth once you do MBBS.

Mechanical engineering is a better option.

You can go to the respective colleges websites & read the instructions for admission in their college. If they have option for online admission then apply.