World History must be mandatory, damn it. It's one of the most interesting things in the world if thought correctly. And it can do good to you to, probably. Teach you mistakes they made in the past and so on.
Also, In Lithuania, the School system just sucks. There's no argument about it. Our schools are severely underfunded (The parents have to pay the school voluntarily to keep it in, at least, a mediocre state of deterioration.), no free periods, most are in an extreme need of repair, the school staff is severely underpaid (but most are qualified and very good at their subject), the students are treated like garbage, the Almighty Director (I.E. Headmaster or Principal) is king/queen and you have to listen to everything he/she says and the food costs a lot and is crap.
Also, there's much cursing, violence, drug use, smoking, drinking and underage sex that no one does anything about. And I swear, you can almost always hear people saying something about a kid who pulled out a knife in a fight and they had to call in the police who then beat him unconscious. Heh, Good times... I mean, Bad. Really bad.