M.Sc Chemistry

You need to understand and know the pattern of M.Sc entrance exam before you start with your preparation and for this, here is a link for you:
https://www.shiksha.com/science/articles/how-to-prepare-for-top-msc-entrance-exams-blogId-13489

Hi Appu,
You can pursue M.Sc in chemistry or Maths only if you had chemistry or Maths as your subjects in your graduation, only then you can pursue M.Sc. In respective subjects otherwise you are not eligible for the same.
Good luck.

Hemwati Nandan Bahuguna Garhwal University, Garhwal. DAV PG College, Dehradun. Hemwati Nandan BahugunaGovernment Post Graduate College, Udham Singh Nagar. Gurukula Kangri Vishwavidyalaya, Haridwar. Dear these are the best colleges for your choice of course.

Hi,
Yes, you can appear in IIT JAM exam for M.Sc. Admissions. Make sure to check all eligibility criteria and syllabus of the exam for your subject before applying to the exam.

I hope this link will help you-
https://www.amrita.edu/program/integrated-m-sc-chemistry-Coimbatore.

Yes, it is UGC recognised and its valid.

It is safe to get information, directly from the UGC. You will find there a list of unrecognised universities. Or else, visit the nearest Degree College and find out from them. You will find a list of universities which are fake, if you enquire at them.

You have to understand that all PG courses abroad are specialized one. You may not have it as M.Sc Chemistry. You visit one of the university website and see courses available. You can do Masters in UK as it is one year programme and it will cost you only around 10 Lacs, other countries will be more costly.