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One of the biggest challenges to control the class size to 15 students is the allocation of educational resources. We need more hardware resources such as classrooms and teaching equipment, and we also need to increase the number of teachers. In this regard, the government can increase investment in education. For example, some governments in Europe and America support school infrastructure construction and teacher recruitment through special education funds. For example, some state governments in the United States will provide funds for building new classrooms or transforming existing classrooms to meet the needs of small class teaching according to the school's small class plan.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. Challenges and countermeasures of educational resources

In Europe, countries such as Finland, which are famous for their high-quality education, also implement small class teaching. Finnish schools pay attention to the individualized growth of each student, and the class size is not large, so teachers have more time and energy to tap the potential of students. Teachers can tailor their study plans for students according to their hobbies and specialties. In this educational environment, Finnish students have performed well in programme for international student assessment and other tests, and their innovative ability and comprehensive quality have been widely recognized by the international community.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.Summary: 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.

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 terms of educational concept, teachers also need to adapt to this change from large class teaching to small class teaching. Teacher training is particularly important. Schools can organize teachers to participate in training courses in small class teaching and learn the methods and skills of small class teaching, such as how to carry out personalized teaching and how to organize efficient group activities, so as to improve teachers' teaching ability to adapt to the new teaching mode.2. The change of social concept and educational concept