School of Fear
Sieben Tage Frist (original)
A teenager named Kurrat mysteriously disappears from a German boys' school. Then a teacher is found dead; the mystery grows.
Starring Joachim Fuchsberger, Konrad Georg, Horst Tappert, Arthur Richelman, Petra Schürmann, Karin Hübner, Bruno Dallansky, Hilde Brand, Robert Meyn, Paul Albert Krumm
It's a drama and crime movie, and has a rating of 6.1 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Singapore.