The school offers voorbereidend wetenschappelijk onderwijs (preparatory scientific education) exclusively and is an independent gymnasium enrolling 822 students and 95 teachers, for a teacher/student ratio of 8.6.

[3] The basis for education was the artes liberales, whereby parts of the Trivium were given in Latin and the Quadrivium included music, since the choir boys needed to sing in church.

According to the archives of the Heilige Geest, a religious institution formerly located at what is now the Hofje van Oorschot, they had a fund from 1502 to 1577 (the Satisfactie) for sending good students to Cologne to further their studies there.

[3] In 1553, when the school had been run by Junius, they even petitioned Charles V, Holy Roman Emperor for the right to found a university in Haarlem, but this was never answered.

[4] He almost lost his job when the council decided to start a collegie or university there, but perhaps because Leiden had already been founded, this never happened.