This is arguably the most standard choice. Using the melody of the famous children's song about the end of summer, parents and teachers change the lyrics to fit the classroom.
Mala sveca u tami gori, svetlo znanja nam donosi. Ti si bila ta što nas vodila, kroz školske dane, kroz lepa i zla. pesma za uciteljicu za rastanak
Sad put je naš dalje voden, bez tebe koračamo mi. Al’ zahvalni što si bila, prvi učitelj naš ti si. This is arguably the most standard choice
While not originally a teacher’s song, the theme of "When I grow up" directly addresses where the credit is due. kroz školske dane