You also need to see what requirements your school has. If your school only recognizes full-time, then any form of on-the-job postgraduate is useless to you, even if it is a double certificate. But basically all schools recognize on-the-job graduate students, which is also a kind of academic qualification, which is very helpful for a teacher. Under normal circumstances, a master's degree can lead to a promotion. Some units directly raise wages, generally 500. You can ask Dalian Baocheng if you have any questions. Help, please adopt.