This made 24 million at the box office?
I find this really hard to believe, but multiple sites show that Graduation Day made nearly $24 million during its theatrical run. That's more than Friday the 13th Part 2, and almost as much as Halloween II. Hell Night made $2.3m, Student Bodies $1.5m, Happy Birthday to Me made $10.6m and Eyes of a Stranger made $546,000.
This is according to: http://www.the-numbers.com/movies/index1981.php
Other slashers from '81 like Night School, Final Exam, and Home Sweet Home aren't listed.