This folder somehow involves not just school kids, but specifically either sex in school itself, or at least on campus, and/or student/teacher fantasies.  I'm putting it in Ephebofiles, because while there may be pre-teens, and even college students, the main impetus is mostly high school/adolescent.  However, Tell Your Friends for example happens on a Jr. High campus, and the primary narrator is pre-adolescent, yet mostly has sexual activity with and around adolescents, like her brother.