CBSE 12th

Government colleges have admission on merit based on 12th board marks and that changes every year. It is different for different states every year. You should go through the previous trends of cutoff for the required course. Also, check if you've any reservation.

To get admission in B.Tech you have to qualify JEE Mains or any other entrance exam to get into an expected college. You may get admission in B.Sc courses or any Diploma course.

Yes dear, you can very well give this exam next year but first focus on your class 12th marks.

By taking biology as an optional subject.

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.

Yes, the college accepts students from NIOS board too as it is a recognized board.

Hello,
In my point of view, you should go with BA in economics because economic has many options. There are many course after graduation in economic. actuarial science, Indian economics services, law, economics and its related disciplines.
Financial economics
Labour Economics
Agricultural Economics
Business Economics
Banking Economics
Development Economics
Therefore, we can say that B.A. Economics is a vast course that provides extensive knowledge about the practical and technical concepts that run the world.

Yes, you can get admission in SASTRA for B.E in Computer Engineering college at this score and rank but for that you have to wait till the last round of the counselling.