hi,

I assume you are asking about national science Olympiad exam conducts by science Olympiad foundation every year, candidates who are studying from class 1-12 are eligible to participate in this olympiad competition.

exams dates for this years is 3RD NOV, 10TH NOV & 26TH NOV 2020,

follow the  below link to know more details,

http://www.sofworld.org/nso/about-nso-exam/nso-exam-dates