Aviation

I think you need to complete your higher schooling, so that you will be eligible for further courses, applying directly after class 12th will not be having much value. Now explore and check which is perfect for you.

You can refer the article in the link to get an understanding about the how to be a pilot: https://www.shiksha.com/careers/pilot-91.

Yes, you are eligible for MBA in airline and airport management.
The eligibility is that the candidate must be a graduate from a recognized college /university.
For more detailed information, visit the below mentioned Shiksha link:
https://www.shiksha.com/mba/course/mba-in-airline-and-airport-management-national-college-of-aviation-egmore-chennai-160435

No, Christ only has the normal BBA. They don't have any course as such related to aviation. But you can do the course from other colleges like IBMR, Hindustan Aviation Academy, Institute of Indian Aviation and Allied Management Studies. All of them are really ranked good for the similar course that you are looking for.
Hope this helps you. Be free to share any problem you have. All the best for your bright future!

Yes, you can work.
If you are passionate to help and guide people as well as passionate to work in Airlines, you can apply for job in Airlines after completing graduation.

Minimum 50 percent marks is the eligibility criteria for the admission in cabin crew.

Hello,
You didn't mention that what you are willing to do in Indira Gandhi Rashtriya Uran Academy
But in this, you can take admission in 55 percent, no need to worry.
All the best.
Thank you

As you are from commerce background, and you want to pursue B.Sc in airline and airport management, so as far as University's critiria is concerned, you can get admission in your favorite course, as you mentioned above i.e B.Sc in airline and airport management.