What should I do if my child's grades are not good and he is laughed at by parents such as teachers and classmates?

Encourage children more. Your grades can't be improved in a short time. You should give her confidence, because your grades are not good and you are under great pressure from your teachers and classmates at school. You don't want your parents to hit you anymore. She also knows that what you need at this time is encouragement, comfort and support, so that your child can stand up bravely and face those different pressures.