Compared are the US DVD by Code Red (R-Rated) and the German VHS by VMP (not rated).

There is 1 missing scene with a length of 2 minutes and 57 seconds.

Horror High is a nice 70s horror flick about a student who needs to drink some kind of drug mixture which turns him into a murderous beast. From now on, he kills anyone who has ever harmed him in any way.

Even though the German tape is not completely uncensored, it contains the entire footage cut for the R-Rating. For that reason, using the German tape for this comparison was not a problem.

0 Min
The title differs. While the US DVD uses the original title "Horror High", the German tape uses the German title ("Die Teufelsbestie").
Basically irrelevant, only mentioned for the sake of completeness.
no difference

25 Min
The R-Rated Version lacks the following scene: Vernon's dad walks the dog. Being back home, his wife is already waiting for him. She lets him know that Vernon is on the phone. When the dad talks to his son, he informs his dad about his issues with the cops. One gets to see flashbacks of Vernon killing Mr. Giggs as well. Vernon's dad then tells Vernon he was busy at the moment. After their conversation, Vernon's dad talks to his wife. She accuses him of not taking care of his son and not being there for him.
177 sec