If you want to attend a remedial class, you should look at the teacher personally, not the institution. Parents can be invited to class together, and basic novice teachers will tremble; Secondly, you can ask the teacher a difficult but not abnormal question in previous years and mark a wrong answer as the correct answer. The average teacher will definitely speak according to the wrong answer, and a few teachers will tell the real answer and summarize the questions and general answers. So, I suggest you go to several training institutions, listen and compare first, and see how to make a decision. Anyway, the salesman told you that he wanted you to pay more. Don't feel embarrassed to pay him after listening to a class, just like buying clothes to try on. If they don't fit, they will change or leave. Otherwise, it is a waste of time, money and money. In addition, the one-to-one teachers in training institutions generally have no good teachers, and they are generally novices practicing one-to-one. Of course, I am talking about the general situation, which may be slightly different.