Rock 'n' Roll High School is a 1979 musical comedy film produced by Roger Corman, directed by Allan Arkush, and starring P. J. Soles, Vince Van Patten, and Clint Howard. The film featured the punk rock group The Ramones (Wikipedia).
Several sites mention that Van Nuys High School was used in this film but the movie credits (shown at the bottom) make no mention of Van Nuys but rather Mira Costa High School in Manhattan Beach. So its possible that maybe the interior of Van Nuys was used and the exterior only from Mira Costa. I am not sure as I never attended Van Nuys nor have been on the campus. But IMDB and Fast-Rewind both state Van Nuys as a filming location so I believe it. I captured several images but I dont know which one belongs to Van Nuys.
You can view more SFV Filming Locations here.
Van Nuys High School 6535 Cedros Ave Van Nuys CA
Cant confirm location but appears to be overlooking the SFV possibly from Mulholland Drive.
Another location I can confirm but appears to one of the main boulevards possibly Sepulveda, Lankershim, Vineland, etc.
The movie credits mentioning Mira Costa but nothing for Van Nuys.
And the movie trailer: