Hello,

Science Olympiad Foundation (SOF) conducts the International Mathematics Olympiad (IMO) for the students of classes 1 to 12. IMO Level 1 is conducted for Class 1 to 12 students and then the Level 2 is conducted for Class 3 to 12 students who qualify the level 1. Student's knowledge of logical reasoning, Mathematical reasoning, and everyday mathematics is tested through SOF International Mathematics Olympiad. So yes 5th class student can also apply for International Mathematics Olympiad (IMO).