CBSE 12th

Friend Don't get depressed, you will have lot more chances in your life. If you have failed in Maths than give the supplymentary exam and clear it with good Marks Or you can give drop for 1 year and prepare for both JEE mains and 12th Class.And this time, do well in the exam.

If it is your first try, you have the option to repeat but from personal experience, I would suggest you to get admission this year itself.

Yes you can take it up, but are you sure about your decision to step in another field? All the best and take the right decision.
Thanks for your question.

https://www.shiksha.com/university/university-of-north-bengal-siliguri-25033
Please go to the link. You will get all information here about your query.
good luck

Hi,
Candidates who have a compartment in a single subject are eligible to apply for admission to Delhi University colleges. But if the candidate has a compartment in the subject in which he is applying for admission, then he/she will not be considered eligible to secure admission in any DU college for that course. Thanks!

I can't assure you admission in any of the colleges, despite that here is a list of colleges which offers the course you desire. https://www.shiksha.com/accounting-commerce/colleges/b-com-colleges-Kolkata
Top Commerce Colleges in Kolkata - Ranks, Fees, Comparison
https://www.shiksha.com ranking top.

https://www.shiksha.com/b-tech/colleges/b-tech-colleges-Madhya-Pradesh
All the best.