First, children with good grades have a certain relationship with their parents. I have to say that children's grades have a lot to do with their talents. Under the same conditions, some children can easily get good grades, and some children can't keep up no matter how hard they try. Besides natural conditions, the most important thing is the family environment. Different family environments will produce different children, so children's grades are related to their parents.
Second, parents' attention to their children's learning will affect their grades. Children's self-discipline is generally poor. Some parents are willing to accompany their children to study and urge them to finish the homework assigned by the teacher. Children can realize that parents will pay more attention to their children's grades and their grades will improve. Some parents don't care about their children's study and never accompany them. Such children's grades will be biased.
Third, there are many factors that determine children's grades. There are many factors that determine children's grades, such as children's talent, learning environment, the way teachers give lectures and so on. So you can't just say which reason is the child's poor study. As a parent, doing what you should do well and giving your child enough company is helping your child.