CBSE 12th

Yes, you can. Popular entrance exams for BCA are -
- CUET. - AIMA UGAT
- UPSEE
- MH-CET
- Jamia CET.

You can take economics with Maths. It depends on your 12th board. But most of the boards have economics with math option.

The eligibility criteria for NEET is provided below:
The candidate is required to pass the 10+2 examinations & must have English as one of the subject followed by Physics. Chemistry & Biology. To be eligible for NEET the student need to secure the undermentioned marks in aggregate for PCB:
your - 50%, OBC/SC/ST - 40%, PWD - 45%
So without English you aren't eligible for the NEET.

Please tell me the area of interest you have. Common University Entrance Test CUET can be the first priority if wants to do the undergraduate courses like B.A. B.Sc. B.Com BBA etc. from reputed colleges. Otherwise, participate in upcoming JEE Main April session exam if interested in B.Tech courses. It is remember here that CUET is the mandatory requirement for admission in UG courses in Indian Universities from this year.

You can explore about -
- CLAT
- AILET
- CUET
- LPUNEST
Most of the law colleges generally require minimum 45 or 50 % for admission into law course.

AIIMS JIPMER, AFMC, PGIMER CMC Vellore BVP CET MU OET and KIITEE are the 10 medical entrance exams available. These exams are given for both undergraduate and graduate programmes.

Yes, don't restrict yourself just because you are a biology student. You have equal chances of making a career just as compared to other non-biological students. Yes, you can make a career in computers and programming by pursuing BCA. As you don't have mathematics then you can't pursue Biology.

You should have Maths subject in your 12th standard, which is compulsory subject for doing course in it sector.