Phels High (1969) on Netflix

Loyalty amongst friends isn't always the case, when your life is on the line.

A bond between four high school friends gets destroyed when one of the boys becomes a victim of bullying and takes actions into his-own hands, taking the life of the kid who bullied him. As a result, the four boys take over the school to protect their friend, evacuating every student in the building. Darren (the bullied shooter) finds out that he might have a chance of having a future beyond his failing high school years, but first he must take the life of one of his protectors, his best friend.