First, through the class teacher or classroom teacher, first understand the students' learning deficiencies, and then appeal to parents. Features: clear goals and high success rate, but good relationship with school teachers, heavy workload and small enrollment scale;

Second, hand out leaflets at the school gate. Features: Centralized publicity and low cost. But students can't be the masters, and the success rate is low.

Third, the characteristics of finding agents among students are between one and two.