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2. The change of social concept and educational conceptSecond, the advantage of controlling the class size to 15 peopleSummary: Learning from the successful experience of Europe, America, Japan and South Korea and controlling the class size of primary and secondary schools and college students to 15 students has many positive strategic significance for improving the quality of teaching and training, and cultivating more all-round high-quality talents.

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.I. Successful experiences of Europe, America, Japan and South KoreaDrawing 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.

In the process of educational reform, Korean schools are gradually developing into small classes. South Korea's education pays attention to cultivating students' comprehensive quality. In a class of 15 students, teachers can better organize diversified teaching activities. For example, group project-based learning is carried out, so that each student can give full play to his own advantages in the project and cultivate teamwork spirit and the ability to solve practical problems. At the same time, the Korean education department found that small-class teaching helps to reduce the academic pressure gap between students and promote educational equity.2. The change of social concept and educational concept1. Challenges and countermeasures of educational resources