It would have made zero sense though for us to have those details. The books are written in first-person- limited. This means we only know what Katniss knows. Because the Capitol wants to limit interaction between districts (to prevent another uprising), the government mandated education and curriculum is going to be a) major propaganda and b) limited to essentially just their own district. Any outside info that the masses get about other districts is directly related to the Games (also major propaganda!).

It's one of the limitations of first-person-limited stories, but imo one of the reasons I find it most immersive. Had we known all this extra extraneous info, it would have detracted from the story and characters to me bc it wouldn't have made sense in universe for Katniss to have known all this details.