Does the subject want to ask "what is the problem that the assistant of the class teacher can't open it?" Network problems. According to the inquiry, it is concluded from the relevant data of the extreme head teacher's assistant that when the extreme head teacher's assistant can't be opened, it is a network problem, which can be solved by replacing the network again. The mobile version of Jisu Class Assistant app is a mobile phone marking software specially designed for teachers, which can mark papers anytime and anywhere, systematically count scores, answer questions and performance trends, and view and analyze the learning situation online.