M.Sc Chemistry

You can either do B.Sc in chemistry or BE/B.Tech in chemistry, and then M.Sc.

Depends on what course you are looking for. GMAT may be required, if you are looking for MIM or MBA. Also, you will need either TOEFL or IELTS depending upon the country you choose.

Please refer to the link provided below for details on M.Sc. courses from Mumbai University. You should be able to download their brochure which contains all details regarding number of seats available for courses in M.Sc.
https://www.shiksha.com/university/university-of-mumbai-fort-campus-856

Please refer to the link provided below for details on how to prepare for your entrance exam in various M.Sc courses.
Link: https://www.shiksha.com/science/articles/how-to-prepare-for-top-msc-entrance-exams-blogId-13489

Please refer to the link provided below for the list of entrance exams for M.Sc courses in India.
Link: https://www.shiksha.com/science/articles/top-bsc-msc-entrance-exams-in-india-blogId-13484

Please refer to the link provided below for the details of admission in M.Sc chemistry in Singhania University. You should be able to download the brochure which contains details regarding admissions in various M.Sc courses.
Link: https://www.google.co.in/search?dcr=0&q=Singhania+university+shiksha&oq=Singhania+university+shiksha&gs_l=psy-ab.3.1039127.1042429.0.1042597.0.0.0.0.0.0.0.0.0.0.0.1.1.64.psy-ab.0.0.0.EMRSeEhgBaE

Hi,
The cut-off for IIT JAM Chemistry 2017 is:
General category: 25
OBC category: 23
SC/PWD/ST category: 15
On this basis, you should prepare for 50 marks & you will get 35-40 marks. Your selection will depend on the cut-off.
Well, if you will prepare for 50 marks, you will definitely get selected.

Please refer to the link provided below for details of the entrance exam conducted by Pantnagar University for different courses in M.Sc:
https://www.shiksha.com/science/exams/pantnagar-university-entrance-exam