First, interest affects grades. Your child may not lack the talent to learn English because he is not interested. There are many reasons for not being interested. Probably because he failed in the exam once and lost confidence. 2. Still a teacher 3. Or parents criticized him after he failed in the exam, which made the child feel resistant. Either he doesn't like the English teacher, or he thinks the English teacher ignores him, or he really likes math better. Second, interest is affected by grades. Actually, it's almost the same as the last one. Who doesn't want to learn subjects that they can always do well? Maybe children's poor grades several times correspond to fear or conflict, so they won't look at these difficult things from a distance. Adults sometimes don't want to think about those troubles, let alone children. In this way, children will be farther and farther away from English. Also, you should not be eager to achieve success in your studies. Parents and children must be patient. There are no stupid children. As long as you work together, you will get good grades. It's a bit verbose and the language organization is not good.