How did Tommy describe the old kind of school and teacher?

Tommy says that the old kind of school existed 'centuries ago'. They had a teacher, who was a person. This teacher taught in a special building, where all the kids assembled and learned the same things according to their respective ages.
Tommy says that the teacher of the old kind were people, who taught the students inside a special building. The teachers taught the children in groups and gave them homework and asked them questions.

Regards