Delhi

1)
To become a commercial pilot :
* You need to first possess a Student Pilot License. You must be over 17 years of age and have completed 12th in Science (Physics and Mathematics) with 50%.
* Your vision in one eye must be perfect. In general medical terminology, it is called 6/6 eyesight. In the other eye, you could have an imperfection of 6/9, which must be correctable to 6/6.
General physical fitness is mandatory. You must be free of any disease that can hamper normal function.
* You need to register at a flying club which is recognized by Directorate General of Civil Aviation (DGCA), Government of India.
* Next is Private Pilot License which includes sixty hours of flying. A Commercial Pilot Licence may be obtained only after a PPL and 250 hours of flying.
2)
Some of the institutes offering commercial pilot training are :
-Academy of Carver Aviation Private Limited, Pune
-All India Institute of Aeronautics, Dehradun
-Center for Civil Aviation Training (CCAT), Delhi
-Glorietta Aviation, Ghaziabad
-Fly wings Aviation PVT. LTD., Mumbai
For more, you may refer to the link mentioned below.
https://hospitality.shiksha.com/commercial-pilot-training-in-india-categorypage-6-87-301-0-0-1-1-2-0-none-1-0#page-top
While selecting the best institute, you need to check some of the important parameters such as recognition, year of establishment, batch size, syllabus, faculty, fees, placements etc.
Please refer to the link:
http://goo.gl/iDRQF0