teach students in accordance with their aptitude
Whether a child's grades are good or bad depends mainly on his understanding, and has nothing to do with his cleverness. You are not smart enough to learn this song. It's no use trying, memorizing, and forcing children. It is better to calm down, really understand the advantages and disadvantages of children, formulate appropriate training programs for children, and teach students in accordance with their aptitude.
Discover one's own specialty
I remember those who had bad grades in my class before, but later they changed to art and sports, and now they all live by this specialty.
Accept reality
No matter how hard you try, it still has no effect, because he is an ordinary child, and no matter how hard you try, there can be no qualitative change. As a parent, you need to learn to accept it.