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Getting admission this time is quite difficult, as it is too late for the admission, but you can try in the private college, it might be possible that they can offer you admission but the chances are quite low at this time.

Hi,
Candidate who has completed class 10th with 2 years of working experience are eligible for the admission. Or the candidate who has completed class 10+2 or diploma (work experience not compulsory) are also eligible for the admission.
https://www.shiksha.com/bba/course/bachelor-in-business-administration-indian-institute-of-business-management-and-studies-borivali-west-mumbai-237941

The NCHMCT Entrance exam consist of the following sections –
1) Quantitative Ability
2) Reasoning
3) English
4) GK and Current affairs
5) Service aptitude
It doesn't matter that whether you have science, commerce or arts in 12th. NCHMCT JEE is an aptitude test and any student from any stream can crack it. Quants contain questions of 10th level only so don't worry about that and other sections are new to everyone. If you are determined you can easily crack the exam and get into top IHMs.
All the best!

Hello Yogesh, if you want to practice Mathematics for JEE Mains, then some of the good books are RD Sharma, Engage Publication for advanced level question. Good luck.