1, Fairness: Strict invigilation can ensure the fairness of the game. Because the topics involved in the math contest are difficult, it is easy to be copied or borrowed from other people's achievements. Therefore, the invigilator will closely monitor the order of the examination room to ensure that each player completes the competition in an independent and fair environment.

2. Prevent cheating: Strict invigilation helps prevent cheating. Cheating not only violates the rules of the competition, but also affects the fairness of the competition and the reputation of the contestants. Through strict invigilation, cheating can be found and stopped in time to ensure the fairness of the game.

3. Assessment of practical ability: The purpose of the mathematical competition is to examine the mathematical knowledge and problem-solving ability of the contestants. Strict invigilation can ensure the contestants to play their true level, so as to better test and evaluate their mathematical literacy.