Gujarat University

For M.Sc maths you will have to do first obtain bsc maths and pass it with the requisite % of marks/cgpa or sgpa.

Pharma or BDS or Bachelors degree with physics, chemistry, zoology, botany, biochemistry, microbiology, applied Science. You are required to appear entrance exam for admission. Some well reputed institutes demand minimum 50% in entrance.

Yes, you are correct. The total intake in Masters Degree in Human Genetics at Gujarat University is 10 only.

It is not possible without proper guidance from university. Contact university administration.

No that would not be possible. Unless your university has a UGC authorized credit transfer policy.

You will get all the details from this link.
https://www.shiksha.com/science/course/m-sc-in-food-sciences-and-nutrition-gujarat-university-navrangpura-ahmedabad-270212

https://www.shiksha.com/it-software/course/master-of-computer-application-gujarat-university-navrangpura-ahmedabad-120871
Check out this link, and if the university mentions no specific UG requirements, then you are eligible

Yes, you can do external M.Sc just need to apply online for getting admission for M.Sc.

Fee structure is different for different colleges under Gujarat University, and hence CMAT may or may not be compulsory. University is very generic and has colleges under it.

Regarding eligibility, admission criteria for M.Sc. Chemistry in Jamia Hamdard University. Alternatively, you can also download their brochure which contains accurate details regarding course eligibility, admissions into M.Sc. Chemistry etc. You should follow the admission procedure of Gujarat University, and you can get admission easily.