B.Sc

You can write entrance for Ph.D NET GATE and go to research field. Appear for GATE to secure qualification in PSU:
Write SSC
Work in a coaching institute
Work in an industry / pharma company
This was just to name a few.

Which subject you like the most? Answer to this is the field you should go for. All have good career prospects, Salary depends on ones performance and company's policy.

First of all, complete your graduation (B.Sc. in Chemistry)and enrolled for PG course then you are eligible for appearing for CSIR NET exam in Result awaited category. you will get your CSIR NET qualifying certificate after submission of your M.Sc. mark sheet. http://csirhrdg.res.in/notification_main_dec2017.pdf
on above link you will get answer for every question regarding to CSIR NET exam.

Vishal, I have already replied to your same query posed in the trail.

Prepare from general agriculture objective books and ICAR UG preparation books.

No, Diploma is not necessary to get admission in B.Sc nursing in Canada. Prerequisites Needed to Study Nursing in Canada: To be admitted to either a Diploma or undergraduate degree programme (BN or B.Sc in nursing, students must have completed high school with English, mathematics, biology, and chemistry, with at least a C average. Physics is recommended. For those without the necessary prerequisites, many schools offer a pre-nursing year. Regards.

Prerequisites Needed to Study Nursing in Canada:
To be admitted to either a Diploma or undergraduate degree programme (BN or B.Sc in nursing, students must have completed high school with English, mathematics, biology, and chemistry, with at least a C average. Physics is recommended. For those without the necessary prerequisites, many schools offer a pre-nursing year. Regards.