CBSE 12th

Yes you can apply here. The eligibility criteria of B.J. M. CAT IIMMIT Delhi is 10+2 or equivalent examination from board of school education, CBSE or any other recognised board or 3 years Diploma from Board of Technical Education, or its equivalent. Course duration : 3 Years
Further registration will be open for the Academic Session 2020-2021 in the month of February 2020.

You have a decent score. Though getting admission won't be such a big deal for you yet I advice you to apply to multiple colleges to secure your chances better.

Everything depends on the cut off of the college which provides the course. I will advice you to apply to multiple colleges to secure your chances better. You have a decent score, getting admission won't be such a big deal for you.

Kindly visit the link:
https://www.shiksha.com/mba/articles/40-popular-mba-colleges-you-can-apply-to-blogId-7009

Improvement is a good option, but I request you to reappear in it again for better results.

Yes, private candidates from class 12th CBSE can study abroad, there is no bar to it. You will have to clear the language exams and meet the eligibility criteria of the college in which you are applying.

Your marks are very low and admission can be difficult. Prepare for donations/ management quota.

There are many institutes like ISOMES, amity, Galgotias, SRM, LPU, etc. which offer this course. But your marks are very low and admission could be difficult. Prepare for donations/ management quota.

There are the top 7 Old Iims, then the New and finally the Baby Iims. Old Iims: IIM-A, IIM-C (established in 1961), IIM-B (1973), IIM-Lucknow (1984), IIM-Indore (1996), IIM-Kozhikode (1997) & IIM Shillong. New Iims: IIM Ranchi, Rohtak, Raipur, Trichy, Udaipur, Kashipur
Baby Iims: IIM Amritsar, Bodh Gaya, Nagpur, Sambalpur, Sirmaur, Visakhapatnam, Jammu established in 201516. Now, my personal rankings of colleges would be:
1st group: IIM A, B
2nd group: FMS, IIM C, XLRI
3rd group: IIM L, MDI, IIM K, IIM I, SP Jain, JBIMS
4th group: IIT Bombay, IIT Delhi, IIFT IIM Ranchi, IIM Trichy, IIM Udaipur.

It would be difficult to get a call from NITs as the general cut off for them is 85-90 percentile. But there is a little chance that you may get a call.