B.pharm

You can check the details on:
https://www.shiksha.com/university/barkatullah-university-bhopal-25770

It all depends on you friend. B.Pharma and B.Sc. both are different branches and have their own importance and then the choice depends on your interest and what you want to study. However, I am also a B.Pharma student and personally I find this field quiet interesting and innovating because it will

No, you are not eligible for this course. B.Pharma basic requirements are (10+2) Science, but you are a commerce student, so you are not eligible for the B.Pharma.

No, you are not eligible to do B.Pharma because you are from commerce stream. You should have had science stream in 12th for that.

Here's the list: https://www.shiksha.com/medicine-health-sciences/pharmacy/colleges/colleges-west-bengal.

Listed below are the minimum criteria which candidates interested in pursuing the course are required to fulfil, in order to be eligible to apply for the course-
Successful completion of the 10+2 level of education in the Science stream, completed from a recognized board/university.
A minimum aggregat

There is no option at BITS for changing B.Pharma to BE.

Which exam are you referring to as mostly all national level & state level exams have already been conducted.

Please share your GMR for a better answer.