Terror Academy: Sixteen Candles by Nicholas Pine (Paperback) Berkley Books, 1993. Book has a few marks on inside cover, otherwise very good condition.
Terror Academy Book 3
Welcome to Central Academy . . . it's like any other high school on the outside. But inside, fear stalks the halls. Kelly, Central Academy's biggest wallflower, has changed, becoming one of Central's prettiest and most popular students. She is swamped with calls from all the hot-looking guys, but her attraction proves fatal when her dates wind up dead.