I want to become a Pilot what should i do after completion of class 10

To become a Pilot firstly it is recommended you get a Class II medical test done from a DGCA Approved Medical Practitioner in order to first see if you are medically fit to fly.

A complete list of approved doctors to undertake Class II & Class I medical examinations is available on DGCA website

http://www.dgca.nic.in/medical/class2-ind.htm
http://dgca.nic.in/medical/c1exam-ind.htm

Once you are considered medically fit you can join a flying school .The Flying School must be recognized by the Civil Aviation Ministry. Most Flying Schools accept students who have passed 10+2 Science stream. Minimum marks requirement is around 50% marks .
To be eligible for pilot training one should have passed 10+2 or equivalent exam with Physics, chemistry and Mathematics. For admission, there is a written test that comprises test papers like English, maths, physics, reasoning, general awareness and current affairs. The minimum age to get enroll in a pilot training institute is 17 years. One has to fulfill the medical standard as prescribed by the Directorate General of Civil Aviation (DGCA).

There are institutes in India, which are offering pilot training in India
Indira Gandhi Rashtriya Uran Akademi, Rae Bareli (IGRU)(wwww.igrua.gov.in)
Orient Flight School, Chennai (www.orientflights.com)
Puducherry Thakur College of Aviation
Institute of Aviation and Aviation Safety