B.Sc

Yes, you can appear for JEE Mains but check that your eligibility criteria, as if you have passed your class 12 in 2015, then you are not eligible for that, class 12 LC will be accepted in JEE counselling.

For B.Sc in VNIT, Nagpur, you have to appear for JEE Mains. Then, after it's counselling, you would be able to get the college.

Dapoli Agricultural College, DY Patil University Pune, Bharti Vidyapeeth, etc. are some of the colleges as per your requirement. Kindly apply as soon as possible.
Best regards.

No, Kolkata University doesn’t have B.Sc Geography, you can choose presidency University.

A candidate seeking admission for the Post Graduate Programme should have passed the full time (not by correspondence or part-time Graduate degree examination in Science (class 12th + 3 years degree entire 5 years in Science only) with Physics / Chemistry / Mathematics Microbiology or Biochemistry a

First of all, you should choose your passion what you love to do. If you have interest in technology and engineering, then choose B.Sc Engineering. If not or if you only want graduation for government jobs, then choose general B.Sc and prepare for UPSC exams.

Yes, last year student pursuing B.Sc can give PU-CET. Forms are out on PU website today. You can check.

Simple, attempt just those questions which and are known to you.
Read the guidelines carefully.
Focus on previous year question papers and prepare from that.

It is difficult for you, as these marks are below average. Rest, you can try your luck.

No, it is not possible. But, yes you can get admission in other colleges affiliated to Panjab University.