Expanding knowledge: 3+2 refers to the secondary school, which is a two-year secondary school at the starting point of high school. Students choose their major in middle school and can take part in counterpart study after graduation; 3+2 specialized class refers to the joint running of middle schools and colleges. After completing three years of study in middle school, they will go to the joint school to complete two years of courses and get a college diploma. In the first three years, the technical secondary school charge standard will be implemented, and the teaching will be divided into sections. In the second two years, the specialist charge standard will be implemented. Five-year compulsory college class refers to the recruitment of junior high school graduates by colleges and universities with five-year enrollment qualifications. After enrolling students according to the enrollment plan and results, after five years of systematic study, they obtained the diploma of junior college, implemented the standard of junior college fees, and taught consistently in school for five years. Students from 3+2 junior college and 5-year compulsory junior college can attend junior college for further study after graduation.