Science

Yes, you are eligible for Ravenshaw University. This university conduct entrance exams for admission.

In my opinion, I would suggest you should opt B.Sc as it offers you with more opportunities than BVSC.

You should choose those 4 subjects in which you have scored best marks.

Yes, you should opt for B.Sc biotechnology if you can get a good college under DU. There a wide scope of job opportunities if you do this course.

Yes, there are many job opportunities after doing BCS. The soul truth is degree of B.Tech (CSE) and BCS and MS, both are equivalent to each other. If you do BCS from a college like VIT, Vellore or Bhartiya Vidyapeeth, Pune. You will get good exposure as well.

Hey,
Both the colleges has best faculty members in mathematics but most of the students preferred Daulat Ram College because of its location in north campus.
Daulat Ram College is a reputed college and has all the facilities are provided by this college.