The Plano Independent School District serves most of the city. Student enrollment has increased dramatically over the past few decades. Plano has a unique high school system, in which grades 9-10 attend a high school and grades 11-12 attend a senior high. There are three senior high schools (grades 11–12) in PISD; Plano East, Plano, and Plano West. In Newsweek's 2012 list of best national high schools, Plano West was ranked as 22nd (#1 in Texas), Plano Senior as 108th, and Plano East as 243rd. Small portions of Plano are served by the Lewisville Independent School District, Frisco Independent School District, and Allen Independent School District (Commercial Only for Allen ISD).