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1. Improve the teaching effect.In Europe and America, many schools attach importance to teaching in small classes, and it is more common to control the class size to about 15 students. In the United States, for example, some high-quality primary and secondary schools and private universities often adopt small class teaching mode. According to the data of American educational research institutions, in the small class teaching environment (15-20 students in each class), students' academic performance has been significantly improved in reading, mathematics and other disciplines. For example, in reading, the average improvement rate of reading ability of small class students is about 20% higher than that of large class students. This is because teachers can adjust teaching strategies more accurately according to each student's reading level in small classes.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.

1. European and American casesSecond, the advantage of controlling the class size to 15 peopleDrawing 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.

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.