Science

Yes, you are eligible for B.Sc in fire safety management course. We have already spoken about the course.

After your board exams you have to appear for the JEE examination. You should have PCM or PCB as your core subjects and should have secured a minimum of 40% marks in your boards to qualify for the JEE exams. After you appear for the JEE, selection for bio-technology is done on merit basis.

If you are thinking that you can clear science and make your career in this field then you should go for a tutor. Commerce is also an excellent subject so it totally depends on you.

Different colleges have different criteria for admission into their B.Sc courses. Some institutes have written examinations for admission into their B.Sc courses while others may require a minimum cut-off percentage for their 12th exams. 58% should be good enough to get into most institutes for B.Sc. However, students are advised to check university admission criteria individually.

In whole BCA, you will have only two or three maths subjects and that also won't be very difficult to clear so don't worry and you can proceed further with your choice.

Yes, you can do that as University Grants Commission has given a go ahead to students to pursue two-degree programmes simultaneously.

There are many PG courses you can pursue after B.Sc in maths (Honours). Some of these courses are as follows:
1) M.Sc. in Mathematics
2) Masters in business Administration
3) MCA
4) Masters in Philosophy
5) Chartered Accountant (CA)
6) Chartered Financial Analyst
Selecting the right college can be a daunting task. Here is a link where you can check the rankings of different universities offering these courses:
https://www.shiksha.com/humanities-social-sciences/articles/top-25-universities-in-india-mhrd-blogId-13553