CBSE

First of all, you should apply for CPT. It's an entrance exam for those who want to become a CA. As you are from the science background, I suggest you to join some coaching classes for this exam and then give the exam.

Hi Sagar,
It is difficult to point out a college which will admit you. Admissions are done on basis of merit-lists and/or entrance exams. DU cut-offs generally are very high and vary from category to category, course to course. You are advised to go through this article and have an idea of previous trends, notice how many cut-off lists have been announced:
https://www.shiksha.com/humanities-social-sciences/articles/du-cut-off-trends-for-past-years-blogId-12697

Hello, Susanta,
You can apply for the college then. If you pass your 12th exam before the admission process, then yes.

Hi Vinit, you can look up through this page to see all good colleges for BBA. You have to wait for merit lists to be announced by the colleges prior application. https://www.shiksha.com/search/?q=BBA&bc[]=30&sa=^0^30^0^0^0^0^0^0^0^0^0^0^bc:30&rf=searchwidget&tk=BBA

Yes, you are eligible to apply. You need to have minimum 50% and English as a mandatory subject.

I think you are just doing verbal practice, you need to do more written practice and solve the last year paper to check your performance in the last moment.

Friend,
Give the supplementary test for Maths and clear the exam. And then you can take admission into Private Colleges all over India.

It you have a good physique, then you can go for Army or Navy entrance exams. You can also do B.Tech and B.Sc. If you want to study further, there are so many options available in the market, so choose that career in which you are interested.