As a kid, I remember reading a series of Goosebumps-like books. They were all written by the same author, I think, and there were a half-dozen or so that I (vaguely) remember. The stories all centered around kids attending the...something Academy (my memory wants to say that it sounded something like 'Chaleen,' but that could be way off).
I recall one book about a mummy on the grounds. I think there was a vampire installment as well.
It's not much to go on, but if it rings a bell in your head, please let me know! Thanks!