La liceale nella classe dei ripetenti (1978)
La liceale nella classe dei ripetenti (literally The high school girl in the class of repeaters) is a 1978 commedia sexy all'italiana directed by Mariano Laurenti. It is the second chapter in the "Liceale" film-series and was followed by La liceale seduce i professori. Alvaro Vitali, that in the first film was a student, is here a teacher.
More at Wikipedia.