One-on-one, with strong pertinence, can better check leaks and fill vacancies. Children who walk in this large class or small class are either absorbed in one thing or don't understand it. Teachers can only focus on the difficult points, but children's problems are not necessarily on this. My brother is very good at Yilin pedagogy, and the teacher is very targeted. He can pay attention to the children and give guidance in combination with what the school teacher said. One-on-one mode will not distract children, and there will be a psychological teacher for counseling before the exam, which can prevent children from playing because of nervousness.