1. Typical stuff that they try to simplify science and thus teach stuff wrong, like the classical each area of tongue has a specific taste receptor thing.
2. Government heavily interfere with what is taught in classrooms regarding some subjects, most notoriously the government is quite heavy handed in anti-monarchy rethoric, I was actually shocked when I was in my 25s and started to find out a lot of stuff I learned as a kid were not just misrepresentations or wrong interpretation of things, but outright lies and propaganda, one interesting example: schooling here blame a lot of slavery on monarchy and nobility in general, meanwhile the monarchs actually wrote anti-slavery essays, and even made a deal with England at the time authorizing them to attack slaver ships, at some point the government even made it clearer, told England to treat all slavers as pirates, and gave them permission to even attack docked slaver ships freely. Also schools here teach government was "absolutist", but it wasn't, only reason monarch was letting england screw with ships, is because whenever he tried to make a law ending slavery, with nobility support, the liberals would vote AGAINST it (and mostly out of stupidity too, farms that stopped using slaves had bigger profits, maintaining the slaves was more expensive than paying the tiny wages they were paying to the immigrants).
3. Schooling here has a sort of mandatory political bias, not just as in... most teachers being left leaning (something kinda normal in most of western world), but as in the government explicity dictating that certain subjects need to base their theories on Antonio Gramsci, there is some infamous youtube videos where right-wing teachers argue against that with public officials, in one of the videos a teacher outright ask an official what about the parents rights to not have the kid be forced to learn that, and the official replies that the state knows best, that if they don't want their kids to be indoctrinated, they have to pull the kids from school, and face the consequences.
4. Schools here also teach a lot of useless stuff, with teachers insisting you will use all of it... but I guess this applies to most of the world.