Maths Spl

Yes, you can do it as some colleges accept it.

The minimum eligibility to pursue this course is a Bachelors (Honors) in Mathematics or Bachelors degree with Mathematics as a subject from a recognised institution
some of the reputed university demand 50% in graduation (any course) but they conduct entrance for M.A. in maths.
Hope this helps.

Yes, DU from 2018 said that maths is compulsory to get admission in B.Com or B.Com honours.

Uhh do your M.Sc. In maths.apart from this uhh can also refer some govt. Services, civil servies , upsc exam , iass exam .btw msc in maths is much bttr option for uhhh bcoz after this uhh continue ur m.phill nd phd in dat subject .

If you have Biology as your main subject, you may go for B.Sc. Biology.
Else, pursue other subjects which you think you are good at.
Never get dejected.

Go visit the admin block of your university
They will tell you the procedure to fix it.

You can't go for admissions with a reappear. You need to present a passing result first.

The question you have asked has already been asked by someone and it has been already answered by one of the experts on Shiksha.
https://ask.shiksha.com/i-m-in-class-12th-from-commerce-stream-can-i-do-ethical-hacking-course-qna-1876604

For a good career in commerce I will suggest you that pursue B.Com first with good marks. Then you can do MBA, M.Com, CA or CS.