Science

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

Hi,
A candidate must hold a bachelor's degree in any discipline from any recognized university. Should have secured minimum 50% marks or equivalent CGPA (45% in case of candidates belonging to SC, ST and Differently Abled (DA).
Good luck.

https://www.shiksha.com/medicine-health-sciences/dietics-nutrition/colleges/colleges-bangalore Visit ths given link in Shiksha. Com to get a detailed analysis.

It would depend on the college or university you wish to take admission in. Some may accept. Some could reject aswell.

Yes, maths is compulsory in IPMAT and especially in class 12th.

https://www.shiksha.com/m-sc-master-of-science-chp
Check out this link.

JAIPUR NATIONAL UNIVERSITY is the best college in India for B.Sc. In nursing. They believe that students shouldn't have to compromise when it comes to their future and career. Students will have the privilege of being placed in recognised hospitals, government. Sectors & overseas by showcasing their clinical expertise learning. Candidate deciding to do Nursing is required to possess high motivation towards the Nursing profession, with special Qualities, a spirit of altruism, commitment and dedication to work. Visit: https://www.jnujaipur.ac.in/courses/bsc-nursing/145/

Hi,
There are many colleges in India
Institutes :
Pondicherry University PU
BU Bundelkhand University
Indian Academy Degree College
University of Hyderabad UOH
Are the best options.

Few universities have their separate entrance exam for Microbiology i.e. University of Mysore and it consists of following topics:
General Microbiology. The Microbial World. Microbial Growth and Metabolism. Microbial Genetics. Environmental Microbiology. Genetic engineering. Microorganisms in agriculture. Food Microbiology. Best of luck.

Yes, you can apply for BA after class 12th.