B.Sc

Please check the answer in the link below. https://ask.shiksha.com/i-like-genetics-i-selected-b-sc-zoology-how-is-the-scope-in-the-same-qna-5127839.

It's simple. You need to pass your 10+2 with at teast 50% in your PUC and that's your eligibility.

Currently, admissions are not open.
Please keep a track of the official website for updates.
Link:
https://www.sriramachandra.edu.in/university/admissions.php?pos=5

If you check the fee for different colleges, the overall cost for B.Sc nautical science varies form 8 Lacs to 14 Lacs alone. Keep aside DNS course. In case, you wish to check the eligibility and other criteria about admission in different colleges, then please click the link below for detailed information.
https://bit.ly/2Qbo84K
I am sure it will be of help to you.

Kindly check the eligibility from the link below. https://www.shiksha.com/exams/otet?q=OTET&rf=searchwidget&landing=ep.

Usually, you have around 3-4 months gap after your last B.Sc exam and the commencement of M.Sc programs. As your B.Sc program is running late, you might miss a part of your admission but you will get admission if you are eligible. As the program is running late, you can request the institute to give you provisional admission to M.Sc (as you are likely to get the final result also late).
You can take a letter from college authorities and submit it for M.Sc admission.
All the best.

You can apply for this course after completing your graduation.
if you have completed B.Sc then you are fully eligible for this course.
For more information, visit this link:
https://www.shiksha.com/

Hi Omkar,
You first need to go for M.Sc in maths and then while doing M.Sc, you can take CSIR UGC NET exam held every year and details of it, you can get from the official website. You can also go for integrated Ph.D.