The school, Saint Valerius Academy is a year-round academy that's located in a relatively remote place in Northern Europe, with the closest civilization being the town nearly twenty miles distant. The academy proper is atop a small hill in a valley, surrounded by lush, heavy forest. Its classes are for a high-school only, with college level classes available for the more advanced students. Dorms are provided on-site, and located away from the main school buildings. With each advancing grade level, students are awarded with more freedom(Both in selecting classes and outside of school hours.) One day(Sunday) is given as a relaxation day each week, and the students are allowed off the premises to go to the village.
The Nobles are sons and daughters of the very, very rich, making this a school that's very exclusive and almost impossibly(For an average person)expensive to afford. In return, the school promises to create an exceptionally safe(Via both the highly-trained and paid guards, and the Knights) learning environment that promotes interaction and skills that such future captains of industry would need. While all the classes are available to everyone, the Nobles will only get Nobles as classmates, and so on(The Knights may, in fact, sit in on these classes).
The Middle Class are usually local children who graduated with exceptionally high grades from their schools, and got a scholarship into the academy. The others that make up the Middle Class are rich(But not the super-rich) who can afford at least some of the school's fees and then the sons and daughters of the faculty and staff.
Knights can be selected from the Middle Class, but more often than not they are transferred into the school for the explicit purpose of being a Knight to a specific noble.