B.Com

If you want my advice then I will suggest you to go for Eco hons.

It depends on the college. Most of the colleges have made it compulsory for one to have Maths in 10+2 to be eligible to apply for B.Com (H). This is so, because the syllabus of this degree has a good portion of Maths and Accountancy. There are very less institutes who don't ask for Maths in B.Com (H). Some of them are GGSIPU, Amity University, BHU and Christ University, Bangalore.

IIMs don't provide under-graduation degrees like BBA or B.Com. They serve only post graduation MBA.

The forms open in the first week of March and closes sometime in mid-April.

If MBA is the only option after graduation then BBA will be helpful. If you want to keep other options open then B.Com should be chosen. Paralelly you should prepare for IIM entrance too.

Hello,
If the grade secured in B.Com translates to at least 50% marks, then yes you are eligible to pursue MBA/PGDM from any good college across India.

Yes, you can apply in BHU for B.Com:
https://www.shiksha.com/accounting-commerce/course/b-com-hons-banaras-hindu-university-varanasi-30928

Yes, you can apply for UPSC CSE.
For more information, check here:
https://www.upsc.gov.in/examinations/Civil Services (Preliminary) Examination, 2020

CA is a professional course that you can pursue independently by clearing an open test which is conducted by the CA association. In fact you need not pursue B.Com to become a CA. Post completion of your 12th you can enroll for the CA foundation programme.

Students with Travel & Tourism have good career options in the following industries:Travel, Hospitality, Media, Journalism, e-commerce. A lot would depend a lot on what are within travel industry are you keen to pursue a career.