how I became a commercial pilot and is their any examination to become pilot
Hello,
A commercial pilot is the who charges money for services and this is allowed by the FAA. You have to gain additional requirements for specific jobs such as to fly a regularly scheduled passenger service or to fly an airline. In order to become a commercial pilot, you have to give entrance exam which is the IGRUA exam.
The IGRUA exam is a national level entrance exam conducted by the Indira Gandhi Rashtriya Uran Akademi . The exam is conducted for admission in the Commercial Pilot License (CPL) course and B.Sc (Aviation) degree offered by IGRUA.
I hope this helps,
All the best