Science

Hi,
Check this link:
https://www.shiksha.com/science/colleges/m-sc-geology-colleges-Dehradun
However, the best college among them is Sri Guru Ram Rai Post Graduate College.

If you want to pursue courses related to Mathematics , you can visit this site :- MOOCS

You can apply in Indira Gandhi National Open University for this course. Alternatively, you can also approach any private university in Maharashtra.

You have to clear the backlogs. Once you have done B.Sc. Degree, with minimum percentage requirements, all the colleges will open for you despite the fact that you have backlogs.

M.Sc. Food technology will be the better option as it has larger scope.

Yes, there is a course and colleges like Lovely Professional University, Manipal University and Sharda University provides this course.

It depends on the college. You can consider reputed colleges like Miranda House. The annual fee of Hindu College is 12,000-15,000 per annum, and other colleges like Loyola University would also be in the similar figures.

Manufacturing science will be the better option in terms of placement.

Yes, you can take admission but only in private or government colleges which takes admission on the basis of entrance test.