Science

As you have done your B.Sc so you are a graduate and MBBS is for 12th standard students so it is quite not possible.
You can do M.Sc for better scope and job.

It is a job oriented course that caters to the needs of the IT Industry. IT Industry has had its phases of gloom. Still, the sector has been growing in the recent past. Many IT parks and Hubs are being introduced across many Indian states. So, under such circumstances, going for B.Sc. IT will help one acquire sound IT skills that will help him/her land a decent job in the IT sector. Thanks to the arrival of Digital India and Tech Startup culture, IT professionals demand is once again on the rise.

Yes, polytechnic diploma is equivalent to intermediate that is 12th. You can get admission in B.Sc degree course in lateral entry mode after clearing polytechnic diploma course.
B.Sc Lateral Entry:
Duration: 2 years (Semester System)
Eligibility criteria (Qualifying Exam):
You have to clear 3 year's Diploma course after clearing 10th with minimum 50% aggregate marks in diploma course.

B.Pharmacy is better option for you an many students opting B.Sc after B.Tech so it has more crowd and B.Pharmacy has average good scope than B.Sc. So B.Pharmacy is better.
All The Best

This is Bachelor in Technology in computer science and another is Bachelor in Science CS.
BS is Engineering Qualification In USA and in India It is B.Tech.

H. C. Verma is better than D. C. Pandey. I think you should focus on studies, not other things.

IT will provide you with more technical aspects. But CS is definitely going to help in mastering low and high level programming.