They don't really look it up that much. They just know about it because they know people that go to particular schools or simply see the people from other schools wearing uniforms. It's a peer influence kind of thing... Rather than going seperate ways, friends just go to the same school if they have no other aspect to look upon in particular. It's stupid, but in some cases makes sense if the schools are at the same level and have no significant difference in carriculum and expenses.