Parents of all junior high school students and senior high school students are bent on spending a lot of money to enroll their children in a "famous" training class, because the college entrance examination requires the training class to be directional and linked to the results. So let's consider primary school students. Most of their parents are convenient and willing to listen to the school's advice. They often browse advertisements and leaflets posted near the school gate while waiting for their children. It's best to rent a classroom from their school and have classes on Saturday. Different from the pursuit of "prestigious schools" by high school students and junior high school students, most primary school students are residents near the school. Publicity only needs to choose an intersection near the nearby vegetable market, and then choose a time when a housewife comes back from shopping. The headline reads "8- 12 years old". Many women even find that their children will stop to look at it at this age.