The Homi Baba Centre for Science Education conducts the Indian National Olympiads in Physics, chemistry , biology and junior science. It is a 5 stage process for each subject separately. The first stage of these olympiads is organised by the Indian Association of Physics teachers in collaboration with teacher associations in other subjects. The remaining stages are conducted by HBCSE.

The Mathematics Olympiad is conducted by the National Board for Higher Mathematics. 

Eligibility for the Science Olympiad: http://olympiads.hbcse.tifr.res.in/how-to-participate/eligibility/science-olympiad/

Eligibility for the Mathematics Olympiad: http://olympiads.hbcse.tifr.res.in/how-to-participate/eligibility/mathematical-olympiad/

How to Enroll: http://olympiads.hbcse.tifr.res.in/how-to-participate/enrollment/

Website: http://olympiads.hbcse.tifr.res.in