NSOU - Netaji Subhas Open University

Please refer to the link provided below for relevant fee structures for M.Sc. Maths at Netaji Subhas Open University. You should be able to download their brochure which will give you an accurate picture of fee details for the particular university.
https://www.shiksha.com/university/netaji-subhas-open-university-kolkata-27704

Hello Raj,
Yes, you are eligible for the exam as any graduate is eligible for the civil services exam. So, prepare well and try to score better marks in the exam.
All the best.

No any distance, even most of the full time PG Diploma are not equivalent to a Masters degree, hence, you are not eligible to apply for any M.Phil program. You may pursue an MBA or a Masters program such as MA education and then you can pursue M Phil. Please note that you can pursue M.Phil only in the subject in which you hold a Masters degree.

On the Basis of your Master degree, you can apply for the same subject. If you get admission in another department of the university, which usually takes Entrance or merit base after admission, you have to submit a Migration to the next university.