 The Spencer district changed its name to the Willow Run district.As of the 2006-2007 school year, the Ypsilanti district used the four-tier system composed of Pre-K/K, 1-5, 6-8, and 9-12 Grade Levels that it has used since the 1993-1994 school year.Prior to that, the district used a system composed of Pre-K/K, 1-6, 7-9, and 10-12 Grade Levels since the transition of Perry to a Pre-K/K building.