You mean Wally Maintenance School? Mobile phone maintenance is taught by teacher Zhang, which is not bad. This teacher is a mobile phone fan and likes to engage in high-end mobile phone maintenance. His skills are ok, especially practical, and he is more responsible for our students. You have to get your own certificate, which belongs to the Ministry of Information Industry, and you have to pay for it yourself, 300 yuan. But you don't have to take the exam The school issues a certificate of completion.