NMOS is organised by the NUS High School of Math and Science. The competition is usually held in July. It is opened to all primary school students who have not enrolled in primary 6 level.

The level of difficulty of the competition is pitched at primary 5 level.

All participants have to be registered by their primary school. No individual registration will be allowed.

For more information, please visit:
http://oas.highsch.nus.edu.sg/NMOS/