In each subject, the top five percent of students who can take the 1st Level exam are:
Top 25 zone and class rank holders
Top scorers from each participating school
Students have at least 10 IMO exam takers and 50% qualifying marks.
If they register section-by-section, the top students will be admitted to the second-level IMO test regardless of section.
Students in grades 3 to 12 are the only ones who can take the second-level exam.