You need to take Science field after your 10th in your 10+2 and then you need to get into aviation field for your graduation. Then you need to clear the exams and get the CPL certificate along with 200 hours of flying experience. It is necessary to clear the class 2 medical of DGCA .

Refer to the website below for more detailed information...

https://www.careers360.com/courses/cpl-commercial-pilot-license

https://www.careers360.com/careers/airline-pilot

Best wishes. Thank you.