Maths

Maths is not a mandatory subjects in B.Com degree. Top colleges are listed below:-
Sri Ram College of Commerce, Delhi
Hindu College, Delhi University
LSR, Delhi University
Hansraj college, Delhi University
Loyola College, Chennai
MCC, University of Madras
KMC, Delhi University.

You can go for professional courses like CA CS&CMA. And if you want to do job just after 12th you can prepare for SSC CHSL exam. You can pursue graduation in B.Com (Hons) BCA if you want.

CFI's Commercial Banking & Credit Analyst (CBCA) Certification programme will teach you the most important skills required to start or to advance your career in commercial lending roles.

Yes, you can, you need to qualify certain exams if you want a seat in renowned colleges or university. You should have minimum 50% in 12th (any stream) to do BCA. It doesn't matter which stream student you choose.

Yes, you can apply for B.Sc. Statistics.

No, you aren't eligible for the course, as they require you to at least have mathematics as a subject in class 10th.

Yes, you are eligible to apply for St Xavier's College Kolkata

Candidate Pass at 10+2 level (ICSE/ CBSE/State Boards) in Science, Commerce or Management Sciences stream with minimum percentage from any recognized Board in India are eligible.

As you are commerce student without Maths you are not eligible for becoming a pilot. You can take up Physics and Maths subjects in an open school and then become eligible for pilot training school. Without Physics and Maths you are not eligible for taking admissions in pilot training school.