If you want to apply for a teacher by "taking the post first, then researching", you need to meet the requirements of the teacher qualification examination registration and teacher qualification recognition on ideological and political quality, Putonghua level, physical condition and so on. When recruiting, the employing unit shall examine whether the conditions of the candidates meet the requirements of teachers' qualifications.
The measures stipulate that the probation period is 1 year after taking office. You must obtain a teacher qualification certificate during the probation period. Without obtaining the teacher qualification certificate, the employment contract shall be terminated according to law.