M.Sc

Yes, you can. There are some universities offering M.Sc. Geology to those students who did not have Geology at B.Sc. level.
Banglore university.

No, you are not eligible for M.Sc. in maths. All the universities require B.Sc with maths. However, you can do it from IGNOU (distance mode).

Hi Sanchita,
You will fill the entrance exam in month of April, March and May for various colleges. You can also go for IIT JAM if you have cleared maths in +2 class and its form are out now.

It is available in English medium in most of the universities and institutes. The best institutes and universities which offer M.Sc in mathematics are: IISc, IMSc, IITs, CMI, ISI, TIFR, K. J. Somaiya College of Engineering, Lovely Professional University, Punjab, Birla Institute of Technology and Science, Pilani-Pilani, Rajasthan, College of Engineering, Pune, Pune , Maharashtra, Birla Institute of Technology, Vellore Institute of Technology, Vellore and Gandhinagar, HBTI Kanpur ISM, DST, Dhanbad, BHU, Cochin University, Jadavpur University, Anna University and PSG College of Technology.

There are a few institutes where you can take admission directly on the basis of marks in graduation.
IISc, IMSc, IITs, CMI, ISI, TIFR, K. J. Somaiya College of Engineering, Lovely Professional University, Punjab, Birla Institute of Technology and Science, Pilani-Pilani, Rajasthan, College of Engineering-Pune, Maharashtra. Birla Institute of Technology, Vellore Institute of Technology, Vellore and Gandhinagar, HBTI Kanpur, ISM, DST, Dhanbad, BHU, Cochin University, Jadavpur University, Anna University and PSG College of Technology.

Yes, you are eligible for the GATE exam!

Hi SultanAhmed Sikder,
Kindly refer to the answer posted in the link below. https://ask.shiksha.com/what-is-the-tuition-fees-for-an-international-student-for-m-sc-in-medical-anatomy-qna-5043293.

Hi Shubham Kumar Mishra,
IIT Delhi under the Department of Mathematics provides M.Sc. In Mathematics which can be of help to you.

Hi Dharani Mudaliar,
Gujarat University | Navrangpura, Ahmedabad
M.Sc. in Statistics offering PG Degree Full Time with the duration on 2 years.