Parents spend a lot of money sending their kids to private schools.
Compare the quality of colleges private school students are admitted to vs. public school. Can private school kids handle competitive colleges once they're actually there. Admission records from select colleges, student grades after their first and second semester, private and public school students and teachers, parents. Anyone curious, oxygen bar owners, patrons. Oxygen bar owners, patrons, whoever first develped the idea, research about the elixirs they offer.