Maths Spl

No, there will not be any star mark on your class 12 certificate but marks and grade will be there. If you fail in one subject, then it will show F grade in CBSE board. In other boards they might show star mark.

To pursue BCA you can join from Science, Commerce and Arts background. But to pursue BTech or BSC CS, you'll need a solid background of mathematics.
The main diffence between BSC CS and BCA is BCS CS is concept oriented, It will teach you the Core Concept of computer science which include pure mathematics which will help you to learn anything new very quickly, other hand BCA is application oriented, teach current technologies, but learning new technoloigies or working on Core Computing is difficult.

Yes, surely because mostly the first 2 semesters you have to study Maths, then rest I don't think Maths will be in the course for genetics.

Yes, you can take admission in Kolkata University but if anyone has higher marks then they will get first.

No, you won't be penalized. It is a good choice to do maths hons. It is a great choice with a bright career ahead.

Yes, it is offered.

No, you are not eligible to apply for DUJAT since you do not have maths. Any candidate should have maths either as an additional subject (6th subject) or as an optional subject (5th subject) in 12th standard.

According to: http://iem.edu.in/admission/ (official site)
Eligibility Criteria for BCA:
Candidates must have passed Class XII* /Equivalent Qualifying Examination with English and Mathematics / Computer Science/Computer Application / Information Practices/Statistics/Basic Science II / Business Economics With Business Mathematics / Business Mathematics as subjects in the qualifying examination.

Hi Rohit,
Yes, you can go for B.Sc. In computer Science, even if you don't have computer in class 12th board. Many people are already doing this. There will be no problem at all.
Best of luck.