Science

You can go for B.Ed if you want to make you career in the teaching line. You can opt for the preparation of UPSC exam too. Getting a Master's degree is a good option too.

It depends on the type of business school you want to get in. To get admission in the top most B-schools, you need to qualify CAT. For average B-schools, MAT is a better option.

To get the information about the commercial pilot training course, kindly visit the link mentioned below:
https://www.shiksha.com/career-in-commercial-flying-all-you-need-to-know-article-13472-1

PCM is compulsory for CPL training course.
To get the information about the commercial pilot training course, kindly visit the link mentioned below:
https://www.shiksha.com/career-in-commercial-flying-all-you-need-to-know-article-13472-1
https://www.shiksha.com/career-in-commercial-flying-all-you-need-to-know-article-13472-1

Yes, for Delhi University regulations mathematics is compulsory at class 12th to pursue BMS course. But, it depends upon university to university. You can check another university, if you want to pursue BMS.
All the best.

Yes you are eligible for M.Tech.

India's aviation market is on a high growth path and aims to be the third-largest market by 2020 and the largest by 2030.The growth of the airline industry is also expected to boost other sectors from manufacturers, ground handling services and tourism boards.
There is a career for everyone in aviation. Being an air hostess, pilot, air ticketing, airport duties and cabin crew is the top paying careers in aviation.
You can check the below mentioned link:
http://igia-news-updates.tumblr.com/?ref_url=http://igia-news-updates.tumblr.com/post/153296068674/httpigiaindiaindiploma-in-cabin-crew-services-hmht/embed