 It was strictly an elementary school until around 1990, when an additional high school building was added.Prior to 1990, Nakhon Pa Mak children who wished to attend high school were required to find private transportation to the nearest high school in Mueang Bang Krathum.Each day at Sam Ruen School begins with the raising of the Thai flag, conducted by one male and one female student, while the remainder of the student and faculty body sing the Thai national anthem.