Science

For syllabus, refer the link:
https://www.ideunom.ac.in/

Yes, DU considers the best four marks for B.Sc. in Physics. The best college to get into is Hindu or Shi Venkateshwara.

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

Please refer to the link for details:
http://www.iiserpune.ac.in/admissions/phd-programme/phdadmissionphysics

Yes, you can take admission in Mohanlal Sukhadia University for M.Sc. (Chemistry).

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.

Decent. There are companies like Abbott Nutrition, Boehringer Ingelheim (one of top 20 medicine companies in the world), GlaxoSmithKline, CTS Pharmacovigilance and other few companies which hire in the pharmaceuticals sector. Apart from that, you may find yourself eligible for a lot of well paying a

You can probably go for software engineering as that is the most trending and on demand career these days.

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 a