Class Schedule
Did you know that matemáticas is always plural in Spanish? You say las matemáticas son difíciles, not la matemática es difícil. The same rule applies to ciencias: both are treated as plural nouns even when referring to a single school subject.
Heads up: educación física is often abbreviated as Ed. Fís. on school schedules, but never shorten it to just física in conversation. That word on its own means physics, not PE.