Class 11

Here are the list of colleges which doesn't need Maths, as a requirement. Christ University, Bangalore
Symbiosis Institute of Computer Studies and Research, Pune
Institute of Management Studies, Noida
Lovely Professional University, Jalandhar
Sikkim Manipal University
Manipal University, Jaipur
St. Xeviers College, Jaipur
Poornima University, Jaipur.

Do your best in class 12th. In physics, chemistry, and biology. Focus on NCERT book with any reference MCQ books to get best in NEET exam, then in NEET exam, you must score very good marks, thenn you will get government MBBS College. Your dream college. Hope this helps
Good luck.

Yes you can after passing intermediate exam.

It is not possible for you to pursue B.Arch in order to pursue that you need to have Mathematics, Physics and Chemistry as your primary subjects.

Yes, you can do 11th and 12th PUC. ITI courses, Other vocational courses, Certificate courses, Diploma in Vocation, Domain Skilling programs, Skill Development programs. Or many other courses.

NIOS is more flexible in subjects as compared to CBSE and yes, it is better to choose NIOS over CBSE.

The fee may vary from college to college government college have less fee and in private college, the fee is more. So, I suggest you do it from government college.

Yes, you can take that is an optional subject, but still you can opt for better career prospects in future.

You should start from 11th because there will be boards in 12th and it will create a lot of pressure.