It depends on what stage and class you are applying for. I used to study in an organization called "Must Have Talents" in Nanjing, and I signed up for a sprint course, a small class of 4 to 9 people, which was not very expensive, several thousand dollars. It feels good to go to class once a week, and the class teacher usually arranges certain tasks and returns to class regularly. My favorite is the oral English teacher, whose English accent never falls … so later, after the punching class, I signed up for the brushing class. I hope my answer will satisfy you. You can ask me again if you don't understand.