"Another school?"

Gojo repeats Yaga's words, with a similar tone you'd expect from someone being told Pluto is no longer classified as a planet for the first time. Or another way of saying it: he was shocked.

Since he was a kid, since he went to JJT Tokyo himself, he only knew there to be a school in Tokyo and one in Kyoto. And now... all of a sudden he was being told there is another school, it's just very isolated from people.

Apparently the higher ups suddenly decided to let everybody know because had demanded this "new" school to come to Tokyo to meet the rest of the sorcerers, both from Tokyo and Kyoto. It was very like the higher ups to force everybody into an unexpected, uncomfortable situation.

Gojo, however, was curious about the strength of the students, as well as the teacher.

The door of the classroom slides open, revealing Utahime who seems to have only gotten here, her students probably outside with the Tokyo kids.

"Another school?"

Her own words mimic Gojo's, sharing his shock. They barely have the chance to ask Yaga anymore questions (not that he knew much about the situation either) before there's a knock on the classroom door.