Thanks for writing back.

There are 3 possible ways to map a school: either you create a single node which represents the school, or you reuse an existing building—that is only if the school is just that building and nothing more—or you draw a perimeter all around the school premises (it includes the school but also the schoolyard, gardens, etc.); a good example is here: https://www.openstreetmap.org/way/32974723