Physics

Yes, you can do correspondence course from universities such as IGNOU. They have very liberal structure that would suite people like you.

As per Eligibility Criteria, Candidates who have passed 10+2 level examination with individual pass marks in Physics, Chemistry, Mathematics or Biology both in theory and practice and 50% aggregate marks in the above subjects are eligible for admission.
So you have no chances here.

No, M.Sc. in Physics is a regular course offered by Delhi University. For correspondence course, you can go to private university.

With this percentage, you will not get admission.
But, if you belong to ST category than you will surely get admission in last cut off released by Delhi University.
For more information regarding admission process visit Delhi university website.

Here is the list of the good college for Physics Hons. in India
https://www.shiksha.com/science/colleges/b-sc-physics-colleges-india
Just follow the link.

2018 cut-off
West Bengal Board
General 366
SC 326
ST 283
OBC A 329
OBC B 361
Other Boards
General 377
SC 286
ST 294
OBC A 341
OBC B 340.

Hello Saptarshi, You may refer the link below to know the details about BIB autonomous college, Bhubaneswar:
https://www.shiksha.com/college/b-j-b-autonomous-college-Bhubaneswar-47551.

Yes, your rank is good enough to get a seat in Andhra university for geophysics. You can apply for admission. Good luck.

Yes, Jadavpur University offers B.Sc in physics. You can know more about the admission procedure from here:
https://www.shiksha.com/science/course/b-sc-in-physics-jadavpur-university-jadavpur-Kolkata-273123.