Yes, from 2019 onwards, JNU  offers M.Sc in Mathematics.

You can consider below names -

Andhra Pradesh -

ANDHRA UNIVERSITY, COLLEGE OF ENGINEERING - [AUCE], VISAKHAPATNAM KRISHNA UNIVERSITY - [KU], MACHILIPATNAM DR LANKAPALLI BULLAYYA COLLEGE, VISAKHAPATNAM GITAM UNIVERSITY, VISAKHAPATNAM SRI VENKATESWARA UNIVERSITY - [SVU], TIRUPATI SRI KRISHNADEVARAYA UNIVERSITY - [SKU], ANANTHAPUR etc.

Telangana -

University of Hyderabad, [UH] Hyderabad

To appear for GATE Entrance exam you must have completed your Bachelor's degree in Engineering/ Technology or Masters degree (M.Sc.) in any relevant science subject. So you are not eligible as you are from Arts field. For further information about the eligibility you can go through with given below link.

There are many colleges available in India which provides this course so it would be better if you can share which state you are insterested in. Also, generally you can consider below names -National and Regional Vocational Training Institutes for Women (Ministry of Labour, Govt. of India) in Delhi, Noida,

If we talk about the quality of education and opportunity then US is the best country to do Masters in Computer science. They offer academic excellence, extensive support services for international students, generous funding, a wide variety of educational options and flexible curricula. They provide good funding to internatonal students.

No, JNU does not offer M.Sc Chemistry. For all the informataion in detail about the courses & other information you can go through with given below link.

JNU courses

The question paper for life sciences consists of basics of cell biology, molecular biology, biochemistry and bio technology. So the Graduation level text books will help you for the entrance exams, Go through well with the syllabus properly.

You can also prefer the book

Principles and Techniques of Biochemistry and

It is available in IIT Kanpur and IIT Bombay. 

This career offers great job opportunities in India and also in abroad. The statisticians and their analytic skills are highly demanded in today’s job market.

You can use statistics in various fields such as business, industry, agriculture, government, private, computer science,