You'll have to write an application to the regional CBSE office. For example - if you gave your class 10 and 12 exams in Delhi - it'll be Delhi, Haryana - Panchkula etc.
Don't expect them to send the application to you. They'll say it goes to DGCA directly.
You can:
1. Be proactive and go to their office every other day and beg them for a copy.
2. Contact a flight school near you and tell them to do this for you. You will have to cough up some cash.
PS: It takes time. Do it as soon as possible.