Scooby-Doo and the Ghoul School

Scooby-Doo and the Ghoul School (1988) is a animation, family, tv movie directed by Charles August Nichols rated 7.4/10.

Scooby, Shaggy and Scrappy are on their way to Miss Grimwood's Finishing School for Girls, where they've been hired as gym teachers. Once there, however, they find that not only is it actually an all-girl school of famous monsters' daughters but there's a villainess out to enslave the girls.