Hearing that people have to pay for school always just sounds so weird. I don't mean that as a joke; I know things work differently in other countries, but it's not a thing I actively remember. It always makes me slightly puzzled at first. And then a little bit sad, I guess.
Not that it's perfectly free of course. You're still going to need money for books or various accompanying items depending on the studies. And they can be expensive. If I remember correctly you need to be at least 17 before you can apply for student benefits, and you enter lukio at 16, so... Before that someone has to pay for you. And every student ever has always complained that the benefit is too small. (it is) Also, there's probably a lot of travelling. Maybe even living expanses, if you don't live at home anymore! (but then the benefit should be bigger.)
Oh this is probably not that useful knowledge to anyone here. :|