National Standard Examination (NSE) conducted by IAPT in Physics, Chemistry, Biology, Astronomy, Junior Science is the first step for the worldwide Olympiad.
All further steps are conducted by Homi Bhabha Certer for Science Education (HBCSE), Mumbai.
After NSE examination, next step for the eligible students is the Indian National Olympiad (INO) examination in the respective subjects. (For eligibility refer to students brochure. Statewise quota is available here.)
In case of difficulty, students / parents can contact nearest person from this list.