In the meantime there are hundreds of built examples for passive house school buildings - they are in successful use in Sweden, England, Luxemburg, Spain … and even in China. Here you see a few early examples from Germany.

Riedberg Passive House School, Frankfurt, Germany

Secondary School in Baesweiler, Germany

Planning of Passive House schools

Passive House Building Database - you can search for “schools” on that page.
iPHA provides a map of Certified Passive House buildings on record here.