This is book number 10 in the My Weird School Daze series.
The weirdness never stops
Something weird is going on Mr. Granite has been assigned a student teacher, and A.J. and the gang think she might be a vampire. Miss Mary lives in a cave and sleeps hanging upside down from the ceiling. Her boyfriend, Zack, looks like a zombie and plays in a heavy metal band. And worse than all that, they're British Eeeeek.