The Education Examination Center is a subordinate unit of the Education Examination Institute and a public institution. The Municipal Education Examinations Institute is a deputy-level institution directly under the Municipal Education Bureau. However, some deans have official qualifications. The college has college entrance examination department, self-study examination department, adult examination department, postgraduate examination department and examination center. The section chief is a member of the Ministry of Justice. The center staff you mentioned should be career editors.
According to the regulations of the Organization Establishment Committee of People's Republic of China (PRC), the Ministry of Education is the government department (institution) in charge of education and language work. There are some administrative staff (civil servants) in the Education Bureau, mainly the administrative staff of the bureau, most of whom are career staff, mainly teachers. The teachers who are officially compiled are all compiled by the local education bureau.