Not a style of school, but..... Spring Break is in two days!
Heidi, or Milkmaid Braids are a simple way to give yourself a crown-braid look, so long as your hair when braided can reach half-way over your head.
I didn't pin my up high enough to get the full-headband effect, but it is personal choice. The look is quick and easy, and neatness is not required. Celebrity examples pulled from Google