Not so good, especially at a very small stage, completely lacking in technical content. Exaggerated by the sales staff. Make full use of parents' love for their children. In addition, be sure to read the terms of the contract clearly. Of course, their routine is not to let you know the content of the breach of contract, which is really a trap. In addition, there are various ways to collect course fees. Don't believe that their activities are the lowest price, which is naive. If you are sure to buy it, you have accepted their overlord clause. Otherwise, unless you can't quit school, there's nothing to say. Once you drop out of school, the money will never come back. Finally, try not to buy so many classes, or you will never finish them.