1. First of all, you can contact your primary school and ask their grades.

2. Secondly, if the school does not provide specific query methods, you can try to log in to the school's education management system (such as "Jiangsu Education Cloud") and use your personal account to query.

3. Finally, if you can't check your grades through the school's educational administration system, you can contact your head teacher or classroom teacher and ask them about the specific steps or requirements of the grade inquiry.