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No, it is not possible.

Both micro and biotechnology are deep biology. Biotechnology is more research based. Microbiology is also research based but there is one difference that microbiology students can easily get a job in comparison to biotechnology students.
If you have resources, only then you should opt for biotechnology else you can pursue Masters in microbiology.

No reputed college offers admission to the candidates for its management program(s) via management quota or donation, and the same applies for SIBM Pune as well.

Top international universities in the field of chemical engineering are in the USA. You can opt for MIT, University of California, Barkley and Stanford University for pursuing chemical engineering.

International business is a specialisation in MBA.

In your case, you want to do 3 things at a time and for this I would personally suggest that you should continue with your CS and take part time courses along with that provides you with certificate and degree.

Yes, you can definitely change college after getting O grade in FYBMM. You can apply for some of the good colleges like MMK, Mithibai, NM college of commerce and economics, National college, provided if you stay in Mumbai . You can apply for any of the good colleges in SYBMM. Rest is up to your choice whether you want to continue in the same college or some other college.

Acharya School of Management is a good college to pursue PGDM. It has a good placement assistance too.

Massachusetts Institute of Technology (MIT), USA is the best college abroad for engineering.

You can either do M.Com or MMS. Both are not the worth.
If you are interested in management teaching, go for MMS from a good college.

You can opt for MBA after B.Pharm. It would be beneficial for you. You can avail better job opportunities after completing your MBA.

There are only one or 2 openings in government job in the hotel management sector as there is privatization in these sectors. So, the number of chances to get a government job is very less. But, there are many 4-5 star hotels where you can get higher salary and rank too, according to your work experience.

After USA, it is the most demanding country for computer engineering and the expenses here are also less than USA. Also, its PR process is less complicated than USA so you can go for Canada.

Legacy IITs, IISc and IIITH are the best options for doing Masters (M.Tech) in CS in India.