CBSE 12th

You can join some professional course in Accounting like ACCA. ACCA stands for the Association of Chartered Certified Accountants a leading international accountancy body. The ACCA qualification is recognised and is treated in other countries as being equivalent to their local qualification
Here is the link:
http://www.accaglobal.com/in/en/about-us.html
I hope this would suffice. All the best and god bless you.

Yes, provided that you satisfy eligibility criteria like required minimum score and educational qualifications.

I think there is a provision, but if you fail to qualify then the second attempt score will be considered, I request you to contact the board for clarification.

Yes, you can pursue Diploma in hotel or event management.

Hello Menank,
It's good to know your desire of doing 12th once again. But why, if I may ask, after so many years of doing 12th commerce. There are great opportunities in commerce stream. I feel you should explore these rather than thinking of doing 12th all over again in science.

Yes, you can apply for JEE Mains next year to get admission in any other NIT.

You need to appear for SAT exam in order to pursue engineering from the USA.

For CBSE and state boards, it is more than 75 percent marks or a rank in top 20 percentile. JEE Mains score should be more than 170.

Hello Pratik!
The following are the top colleges for BBA in airport management in India :
1)IIKM Business School, Chennai
2)National College Of Aviation
3)Skybird Aviation, Bengaluru, Karnataka
4)School Of Airlines & Travel Management, Kochi, Kerala
5)Aimfill International, Bengaluru, Karnataka
6)Asia Pacific Institute of Management, Ahmedabad