A common theme in a number of anime/manga/light novels is that the cast are students currently going to school. While some titles use this as a backdrop to show how the cast used to have normal lives before they made to fight in conflicts against aliens/monsters/gods/the military, there are some which just show the cast's daily life in school.
I am wondering: what were the first anime, manga and light novel to accurately represent Japanese school life? Did they ever get any adaptations?