Even just the map of the world is outdated pretty much by the time it's taught.
In 2023 Micronesia made a fairly minor change from the former name, "Federated States of Micronesia". But, in 2022 Turkey now wants you to use its metal name: Türkiye.
Then there's the new country of South Sudan, Bougainville on its way to splitting from Papua New Guinea. And Kosovo shows another problem -- whether its an independent country or not depends on who you ask. That includes regions like South Ossetia, Transnistria, Catalonia and Taiwan.
Then there are things that students are taught that we've known are wrong for over a century, but the fully correct version is too complex for anything below a university course. Like, Newton's laws are appropriate for high school, but they're known to be incorrect and are simplifications of Einstein's refinements. But, they're close enough for most purposes, and understanding Einstein's stuff is pretty hard. Same with models of the atom.
And, history is another subject where the deeper you dig, the more the generalizations you're taught are shown to be wrong. The names and dates might be the same, but the reason X happened is often a whole lot more complex than the simple reasons given in high school.