If you don't understand what an exam is, tell your child that when the teacher looks at the requirements, he should write down what he knows as required. Try to let the children know about the exam at home.
If the child can't do it, but for mental problems, you have to take exams to make up for the child.
Also, it is illegal to say that primary school students only have one exam each semester, that is, the final exam, and nothing else is called an exam, which is called an "exam". :)