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Japan and South Korea also have experience in class size control. Japanese school education emphasizes refined training, and the class size is generally small. In a class of 15 students, teachers can pay close attention to students' psychological state and learning progress. Japanese educational circles believe that a small class size helps to create a good teacher-student relationship, which has a positive impact on students' physical and mental health and learning motivation. According to the survey, in small class teaching in Japan, students' participation in class has increased by nearly 30% compared with that in large class.Drawing lessons from Europe, America, Japan and South Korea: Controlling the class size of primary and secondary schools and universities to 15 students to improve the quality of teaching and training.1. Challenges and countermeasures of educational resources

In terms of social concept, many parents and social people are accustomed to the traditional large class teaching mode and think that large class teaching is a normal state. To change this concept, education departments and schools need to carry out extensive publicity. The exhibition of educational achievements can be held to show the outstanding achievements of students in small class teaching, including the achievements of students' academic progress and comprehensive quality improvement.It is also more beneficial to the cultivation of students' artistic and sports specialties. Teachers can discover the potential of each student in painting, music and sports, and provide them with more opportunities for guidance and participation in related activities. For example, in music class, teachers can give each student more time to practice solo and improve their singing skills.2. The change of social concept and educational concept

When the class size is controlled at 15 students, teachers can know more about each student's learning situation. Teachers can provide targeted counseling for each student's weak points of knowledge. For example, in mathematics teaching, teachers may only explain the knowledge points in a large class, but in a class of 15 students, teachers can find each student's problems in algebra, geometry and other different sectors, so as to explain the problem-solving ideas in a personalized way.1. European and American casesIn terms of social concept, many parents and social people are accustomed to the traditional large class teaching mode and think that large class teaching is a normal state. To change this concept, education departments and schools need to carry out extensive publicity. The exhibition of educational achievements can be held to show the outstanding achievements of students in small class teaching, including the achievements of students' academic progress and comprehensive quality improvement.