International Olympiads in Science and Mathematics are the world championships for school students held every year in a different country. Countries send a delegation of students and leaders to participate at the International level.
The most famous Olympiads are
India has been participating in the international Olympiads in Mathematics since 1989, and later started participation in Physics (1998), Chemistry (1999), Biology (2000), Astronomy (1999) and Junior Science (2007) as well. The nodal agency for all the science and mathematics Olympiads in the country is the Homi Bhabha Centre for Science Education (HBCSE), a national centre of the Tata Institute of Fundamental Research (TIFR). The first stage examinations of the Olympiads in Astronomy, Biology, Chemistry and Physics are conducted by IAPT, while the later stages are the responsibility of HBCSE. From 2022, IAPT is in charge of all stages of the Junior Science Olympiad.