St. Xavier's College Kolkata

Math doesn't matters whether you have taken it or not in your 12th grade. B.Com has nothing to do with it. Some colleges prefer math at the time of taking admission. You can cross check first what this college wants?

No, its not compulsory, they runs variour programs in various fiels so, you can choose one of them.

No, as far as I know the basic criteria is B.Sc Physics Honours.
However, you can try other colleges across India including IIT, NIT, IISC. You need to qualify JAM only.

For B.Sc Computer Science, you have to score good marks around 80 above. But, my personal experience is that you have to work hard, and get as much marks as you can get. It will help you in future also.

You need to have minimum 60% to be eligible for biotechnology.

After completing your 12th, you can do BBA or BBM with special subject finance where you can study both business studies and finance too and if you want to do masters, then after completing your course, you can do MBA in finance also.

Hi Som,
There's no such course in SXCKOL.
It's a department which offers a general elective subject called Film Studies in your 1st & 2nd semester only. Any student of any honours discipline of BA and BSC can opt this.
Please visit the following link to know more about the subjects which are offered.
http://www.sxccal.edu/admissions/SXCAdmission2018/UG8102/infoBABSC.htm
If you have any further queries, please feel free to ask.
All the best.