B.Sc

You will have to wait for the cutoff to be out and then apply for the college which takes your percentage.

Doing B.Sc. IT from a government or private college does not really matter. What matters is how much do you learn during the course and how do you hone your skills.

Yes, you are eligible and you can apply for the same.
It lies between 55 to 70% for SC/ST/OBC candidates
The cut offs change every year. They're a bit different for different categories (general, OBC, etc.). And for students coming from various boards (state, CBSE). You can get previous year cutoffs and merit list on the Internet. The college website has all the information regarding registration, admissions for FY, which has started, I suppose.
www.fergusson.edu
Hope this helps.

Kindly get a migration certificate from your school there. After that, you can.

You should prepare for CAT (common admission test)/MAT/XAT. IIMs, Business schools or top ranked universities like DU, BHU, Assam University, Anna University, University of Madras, Mumbai University, Loyola College, etc. and IITs (those provide management courses) are better options for doing M.B.A. in India.

A B.Tech or M.Tech (food tech) degree holder can get a salary of 3-4 lacs to start with. With the stepping in of MNCs, the job prospect has become more lucrative. With experience, you can also get a job abroad.

Yes, you can definitely apply for government jobs. But for the pharma industry, other than the job of MR, they mostly look for B.Pharma graduates. To be more clear, they prefer B.Pharma graduates over other candidates.