This teacher, whose students are all in Grade One, has his own thoughts and ideas. It is impossible to educate him with those fixed cases. You know, what you said to him was like reciting it to him. He said he was stupid and couldn't learn, because he didn't want to learn or didn't know how to learn, so he couldn't learn efficiently. Because of these two reasons, according to his own situation, his family and himself preached to him and gave him some practical cases.
I believe everyone has their own ideals and goals. You make clear his goals and ideals, build up his confidence and give him interest in learning. Teach him free and easy learning methods. I believe that as a teacher, I still have such an idea.
Don't always take some rigid cases, people will hear them as soon as you export them. Combine a student's personality characteristics, family situation, own advantages and disadvantages, relationship with classmates and many other negative aspects. And the tone of voice is also very important. You should impress him. Don't forget it as soon as you finish. It goes in one ear and out the other.