hello aspirant,
I will provide you the best information regarding becoming pilot after your 12th.
Note the following points carefully and make sure in following these ways:
1) The foremost basic criteria to become a pilot is you should have atleast 60-65 percent in your class 12th aggregate
2) visit  DGCA (directorate general of civil aviation website and carefully read thoroughly all instructions
3)you need to visit different websites and different types of flying schools have their entrance exams
4)Apply for that entrance exam where you will go for written test, interview and notorious pilot aptitude test .
5)After passing that test, you will get commercial pilot license (CPL) , so that you will be getting a license and hence you will become a pilot.
6)Also, to become a pilot, you need to study NCERT books regarding class12th for effective preparation
Thank you