1. Quality problem: According to the feedback from students and parents, there are mistakes and omissions in the content of Euler's junior high school mathematics, which will have a bad influence on learning and mastering.

2. Reputation: There are some problems in the operation and service of the training institutions affiliated to Euler's junior high school mathematics, such as false propaganda, default refund and substandard teaching quality, which have caused unnecessary economic and time losses to students and parents and reduced the trust in the institutions.