Not in schools. Schools have to be constructed of non-combustible materials. Building and fire codes even set limits on how much of the [non-combustible] wall surfaces can be covered by paper (bulletin boards, art work, etc.). Fires in schools almost always involve the building contents, not the building materials.
I had no idea that every school ever built has been remodeled to the new standard of building codes . Are you sure schools are built this way or did you mean all new school construction shall follow these codes ? I don't think the schools I attended in the 70's were built of these materials and they are still active schools today . In fact if I had to guess I'd bet the over whelming majority of schools are not built from these materials .
Fires in schools almost always involve the building contents, not the building materials.
When that content does burn it's often very toxic . My guess is half the deaths it fires are do to smoke and toxins incapacitating the victims first . IMHO it's important to get out of any building on fire regardless of the building codes they followed when building the structure .