Pilot

The fees varies college to college. The cost to become a pilot in Delhi, is very high, minimum INR. Rs.12 Lacs.

Choose PCM stream in 10+2. There are different requirements of different colleges but the basic one is at least 60% marks but actually you must have 80% for getting admission in a good institution. I would suggest you IGA, Delhi which is one of the best in India. Duration of courses also vary from college to college.
All the best for your future.

Money aspect would come around 40-50 lakh. The cost could only go upwards of that sum.

It varies from institution to institution. The thing which you have to pay for is the different types of license. Today, it can cost you above 80 lakhs to get all the licenses and become a pilot.

No barriers, still you need to be fit and fine with normal height and clear vision.

No, you need to have a min 60% and that too with PCM not PCB.

You need to appear for NDA, if you wish to join after class 12th else after graduation you can give AFCAT to become a pilot of fighter JET.

You have a good percentage. To be a pilot one needs to have a Science background with minimum 60% marks. After that you need to have a CPL license and many more license, which you'll further know through the institution.