This is the 897th most frequent Czech word.
škole
"Škole" means "school" in English (dative or locative singular form).
Here, 'škole' is in the locative case, indicating the location where the action took place.
Byl jsem ve škole.
I was in school.
In this case, 'škole' is in the dative case, expressing the topic or subject of discussion.
Mluvili jsme o škole.
We talked about school.
In the sentence, 'školy' is the genitive singular form, used due to the verb 'docházet' requiring the genitive case for its complement.