When you graduate from primary school and are about to go to junior high school, or when you are going to apply for junior high school, the primary school will print a student registration form for you. This form is printed from the student registration website, and then the school will stamp the official seal of the primary school. You can take this student registration form and go directly to the corresponding middle school to enroll. Then the middle school will transfer your student status from the original primary school to the middle school you are studying now according to the student number on this student registration form.