Science

Yes, B.Sc in hospitality can be pursued. But, the question is why you want to pursue it after third year B.Com.
If you are already in third year B.Com, then go for M.Com or MBA. If hospitality is something which you are fascinated about, then do some small courses in hospitality or hotel management

Yes, checkout the below link for B.Sc courses provided by Banasthali Vidyapith:
https://www.shiksha.com/university/banasthali-vidyapith-jaipur-3155/courses/bsc-bc

Refer this link for the courses of science stream in DU - https://www.shiksha.com/university/du-delhi-university-24642/courses/science-s

Yes, you can peruse BA in economics.

Mumbai University offers distance learning programmes. B.Sc Computer Science is also offered. But, as per me, if you go to pursue it now, you will have to complete the first two years too again in correspondence.
Also, try to enquire at IGNOU. They might have some provisions which might help you.
All

Bioinformatics is very good sector. Also, computer Science has a lot of job. Getting a job in computer Science is easier than in bioinformatics. Study of biology with the help of computers is bioinformatics. Also, every sector is digitizing. For instance, combination of computers and finance has giv

Hello, Minimum percentage required for B.Sc Nursing is 45% of marks. That is, any candidate must secure minimum 45% of marks from the recognized University with Physics, Chemistry and Biology are the Main subjects. And, you must have English language as the Main subjects.

Hi, yes maths is compulsory for B.A(Hons.) economics from Lady Shri Ram and one must have studied mathematics till 12th and pass in it. Mathematics is compulsory either it have been taken as optional subject or non elective subject.