The teacher who teaches him will know him better.
When I was in primary school, I took the fifth grade exam. When I was in grade five or six, I went to my math teacher's house to do my homework every day after school.
As long as he is interested in reading Chinese, let him read more books and extra-curricular books. Anything is fine as long as it's not yellow. Maybe he can't read famous books. If he is young, he can read some fairy tales, which will be very helpful to his writing. In addition, it is best to form habits at home. Parents should spend some time reading together and reading different books every day, so that children will form this habit. Now I am the first in the Chinese exam, and I was also a child. Now mom and dad are very busy and won't read books together, but I am used to reading books and will read them whenever I have time.
As for English, I'd better go to the teacher's house to make up it. Counseling can not only improve, because teachers' understanding of exams is also very beneficial to improve their grades. When doing English questions, let him say why, what tense and phrase are used in each question.
Do more math problems to improve your familiarity with knowledge. After talking about all the knowledge points, give him a question to do, give him guidance while doing it, and comment immediately after finishing it. Ask him to explain the process of the problem correctly and tell him what is wrong and how to solve it.