The Mathematical Olympiad Programme in India, which leads to participation of Indian students in the International Mathematical Olympiad (IMO), is organized by the Homi Bhabha Centre for Science Education (HBCSE) in collaboration with the National Board for Higher Mathematics (NBHM) of the Department of Atomic Energy (DAE), Government of India only. The 1st stage is conducted by Indian Association of Physics Teachers (IAPT).
For Details on Mathematical Olympiad, visit HBCSE website: http://olympiads.hbcse.tifr.res.in/