Don't treat yourself as an adult, treat them as friends, or rather consult each other. Because junior high school students now feel very good about themselves and think they know everything. It may also be that you don't understand some questions their teacher said, so you should ask him for advice. You should stick to your principles on some issues, such as academics, but you should not rely on seniority on some issues. You should know how to argue with him by betting. Let him have a strong interest in mathematics and cultivate his independent research spirit and indomitable will, which should be your goal.