You couldn't have grown up in the fifties or sixties without watching a Coronet Film in School. They were usually 15 or 20 minute films that were shown on great big movie projectors that, if you got to operate it, was always a big thrill. Of course this was before video and even if it was a silly topic, it was fun to sit in the class with the lights out and pass notes without getting caught.
I have found several of these films at the Internet Archive, which specializes in Public Domain material. A visit there is well worth your time as you will find a treasure trove of material. In the meantime, enjoy these films. Perhaps you will remember one of them if you are a boomer.
Beginning Responsibility: Lunchroom Manners (1959)
The rude, clumsy puppet Mr. Bungle shows kids how to behave in the school cafeteria - the assumption being that kids actually want to behave during lunch. This film has a cult following since it appeared on a Pee Wee Herman HBO special.
Going Steady? (1951)
Attempts to provoke teens into discussion on the complex issue of going steady. Provides little support for the practice.
Dating: Do's and Don'ts (1949)
Classic instructional film for teen daters, presented here in the rare (but incomplete) Kodachrome version.
Self-Conscious Guy (1951)
Shows how feelings of self-consciousness keep a high school boy from doing his classwork well or making friends easily.
How to Be Well Groomed (1949)
Siblings Don and Sue show how they keep themselves well groomed throughout the school week and for their Friday night dates.