CBSE 12th

You can join any good college in India by scoring good marks in JEE mains. IIT NIT IIIT and many other private colleges. To pursue your interest in app development, you only require good practice in programming. All the best.

If you are interested in coding and analytics then go with science as a subject of study. Don't forget that economics also have so many career opportunities.

If you come in category like ST/SC OBC, then only you can.

Please elaborate your question for better assistance, as whether you should take a drop or not is your question or something else?

For CS branch, fee would be not greater than 15 Lakhs for 4 years. Yes, admission depends on 12th percentage as many colleges have the minimum eligibility criteria of 12th marks.

You don't need to undergo as such for any entrance exam for pilot training. All you have to do is start your career in aviation and try to finish your CPL exams asap and start your flying.
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You can refer to this very useful article https://www.shiksha.com/courses-after-12th/arts.

Yes, why not. You can get enrolled in BBA. I would suggest Amity University for distance learning as you have very good marks. So, you can get a 10% scholarship also from there. Amity is a brand name university. It's an internationally valid university and UGC approved. So, it's better to go with Amity.

Yes, you can do BBA or B.Com from Delhi university without maths in class 12th but I want to tell you something, in the second year of BBA and B.Com you will have to study mathematics as it is a compulsory subject so I would suggest if you are in 12th then take maths as well else you will be worried in graduation because 12th mathematics comes in graduation. As you are looking for BBA then I would suggest for other universities also like Annamalai University Amity University, Mewar University, etc.

You can definitely try for SRM, VIT, Amity University and the colleges who have their entrance exams, so that your don't have to pay donation.