If your child falls behind in math when he is in the first grade, it would be better if parents can help him, which can cultivate the parent-child relationship between you. Slowly, you can also find out which aspect of his mathematics is weak, and then make up lessons to improve it. In addition, if you don't have such a good foundation, you can choose cram school. There are many remedial classes for children with weak mathematics, and parents want to help.