Aviation

You can get a private pilot license. It's duration is 6 months. After completing this, you can fly any private charter plane.

No, you have to obtain 55 percent marks, but there is no other problem. You can give maths again with NIOS to obtain good marks after that you can apply for CPL training course.

Yes, you can pursue aviation course also. You have to pursue a basic course from Frankfinn or other aviation institute then you can go for this course. But, as you have done Diploma in civil best option would be to go for B.Tech in civil.

It is a wise decision if you can spend around 90 lakh rupees.

Yes, it definitely has. The aviation market in India is booming nowadays and all the airlines are looking for more and more qualified and skilled pilots by the end of 2018. This is the correct time to embark on a career like this. I too want to become an airline pilot.
You won't regret the decision of becoming a pilot.

You can apply from the NFTI, Gondia. You need to take an entrance test followed by interview and group discussion.
The fee is 90 lakh rupees but you will get the job for sure.

You need to spend around 20 lakh rupees if you are pursuing CPL training course from a government institute. If you are doing CPL training course from a private university, then you need to spend more than 30 lakh rupees.

No. To become a pilot, you should go for science stream in the plus 2 level.