Ans: There are no such eligibility criteria like minimum marks required. The students of classes 1 to 12th are eligible to appear for the 1st level IMO.
But the students who qualify for the 2nd level of IMO exam have.
Only Top Top 5% of students’ class wise get selected for the 1st level exam,
Top 25 rank holders from the state are chosen for the national level exam.
At least 10 students from a class appear in the exam from a school and they’ve to score 50% at least qualifying marks.