Class 11

Totally your choice all your subjects till 12th other than accounts actually have no relation and also if you aren't from accounts background it's alright.

Hello Kumar, For JEE Mains and JEE Advanced, you have to study both 11th and 12th CBSE syllabus because most of the contents are linked to the previous topics so you cannot skip one of them or focus on just one. Also you have to secure good scores in boards too. This balance will help you to get a good percentile score at the end.
Good luck.
Thank you.

Hi Aishwarya,
You need to check the SAT test dates on its official website and schedule it accordingly. Find it here:
https://collegereadiness.collegeboard.org/sat-subject-tests/register/international-registration/test-dates-deadlines

To apply for the post of professor, you need to have a specialization subject which you can choose during your duration of pursuing UG degree. After all, the institute has different requirement criteria, but majorly they require you to have a doctoral degree with a particular specialization.
Most of the recognized universities require you to have appeared and cleared the NET exam after which you are eligible for the post of assistant professor or State Level Eligibility Test after which you can work with the state level universities, colleges or institutes.

Yes, you can get admission in 12th NIOS.

Go for a diploma course in Photography or else go for a degree course like B.Sc in Media Science/Mass Comm.

Surely, you can as you have physics, chemistry and maths as the main subjects in class 11th.

Yes, you can. Try to check BBA colleges without maths. I think Guru Gobind Singh Indraprastha University, Madras Christian College are other good colleges which allow BBA without maths.