This is the 146th most frequent Serbian word.
школи
The Serbian word "школи" means "school" in the dative or locative case.
In this sentence, 'школи' is used in the instrumental case to mean 'to the school'.
Идем у школи сваког дана.
I go to the school every day.
Here, 'школи' is in the locative case, referring to a location, i.e., 'in school'.
У школи смо учили историју.
In school, we studied history.
In this instance, 'школи' is in the dative case, indicating the subject of a discussion, i.e., 'about school'.