All 4 Uses

preparatory
in
Betrayed: A House of Night Novel
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Then it had been a stuck-up rich kids' prep school, but it had originally been built as a monastery for the Saint Augustine People of Faith monks.†
Chpt 3 *
I remember that when I asked how the prep school had been talked into selling to the vamps Neferet had told me that they'd made them a deal they couldn't refuse.†
Chpt 3
I pulled up Google and typed in "private preparatory schools?†
Chpt 3
It was an exclusive East Coast prep school and, man, did it look stuck-up.†
Chpt 3

Definitions:

(1) (preparatory)
done to get ready for something that will happen later
(2) (meaning too rare to warrant focus)
The expressions preparatory school and preparatory classes typically imply preparation for college. Often, preparatory school is shortened to prep school.