M.Sc

Yes, you can apply.

https://www.jnu.ac.in/math-course
open this link and you will get answer of your question.

Yes, agriculture student can do, but it is better to go with agriculture subjects u will have good scope in this.

You must have 60% aggregate marks for your Bachelor's degree. For taking admission, you must hive the entrance and qualify it.

Hello,It isn't a good choice at all for pursuing MS or PGDM. Still, if it's possible to wait for the MS admission, then surely do. At that CET score, you could've tried for the PGDM programs of better colleges like SIES, NL Dalmia, Chetana, etc.

Fees may be approximately INR.30,000-40,000 for this course.

MS is best if you are interested in research and for doing Ph.D in foreign universities where M.Tech is more academic oriented. MS in India in IISC or IIT is good and have better placements. For MS in US, you have to spend more money than here. M.Tech has good placements. The highest offer for M.Tech in CS dept in 2017 batch in IIT Madras is 1.82 crore if you care for good job you can take up M.Tech while MS is research oriented
Good luck.