I've read/heard that their were schools, at least for the upper classes. With grades and instructors. Is there any truth to this?
While you wait on additional answers, here's a few past posts on the topic:
What was Aztec Schooling like? by u/fikstor
How did education work in the Aztec Empire? by u/pseudogentry
What would it have been like to grow up as a girl in the Aztec Empire pre-colonialism? by u/400-Rabbits and u/drylaw