I was a teacher at that time. Telling the truth, Sien education is spicy chicken. More than 90% of them are college students with no teaching experience, all of whom are liars, and many of them are mining universities (three books) and junior colleges. It's easier to sign up for money than to refund it (generally speaking, today's finance is not cheating). Many college students who go to work can't get money after graduation, and all kinds of deductions are made. Various reasons. Don't listen to someone's hype. Even if someone says yes, the teacher is looking for money. More than 95% students go there just for fun. Because I have a good relationship with the teacher, I don't want to refund the fee, but my grades can't be improved. Finally, I used various excuses to say that the students did not do well in the exam. You won't believe this. With that money, it is better to go to a private training class, where the quality is really poor.