Hogwarts.

Hogwarts and Castelobruxo were schools that hated each other quite a bit, but they decided to try to put that behind them—and by that, I mean they were forced to. The final-year students from Castelobruxo had to visit Hogwarts under the supervision of their professor, and obviously, they did so reluctantly. They arrived by passing through a portal, which led them straight into the Great Hall of Hogwarts, where all the Hogwarts students were gathered, along with the Headmaster, Albus Dumbledore, who was awaiting Castelobruxo's arrival. Castelobruxo accepted students from all Latin American countries (except the USA), and Argentina was at the forefront along with, obviously, Brazil (they are in that country, duh). At Castelobruxo, they had managed to develop a new type of magic that was much more advanced, one that didn't require wands—simply hands. Instead of a wand, they had a core, which occupied the place of the heart and was like a sphere of white energy. They surpassed the other schools by A LOT, and that was well known.

I put it as "Hogwarts" so that they can put which character they want to interact with, and thus it will be more comfortable.