I am a teacher and the educational director of a training school. The way we recruit students is to have demonstration classes in crowded places and distribute leaflets in schools and crowded places. Our main purpose is to get a list of students. After we had the list, we began to call these lists crazily and invited them to take a demonstration class. Those who come to class, continue to follow up, those who don't come to class, continue to call, but not too often.