I don't know whether it is formal or informal. I enrolled in a junior college. She claims to be an educational institution in China. Before signing up, she said that she would mail invoices and study materials. After signing up, she didn't post anything. She just gave me a video application. The development of APP is Chinese education in Shenzhen, but the money was given to Xinjiang Pinxue Education Co., Ltd., and she brushed the video on it herself, that is, there is no class group, and the class teacher will not tutor you. The so-called class teacher is only used for dunning. I was.