Dear Chetan, To become a commercial pilot in India, one has to first possess a Student Pilot License (SPL). To get the SPL those with 10+2 with science and aged at least 16 years should register at a flying club which is recognized by Directorate General of Civil Aviation (DGCA), Government of India.
To known more details about this career log on to, career.webindia123.com/career/options/travel_tourism/commercial_pilot/intro.htm