EXCLUSIVE: Queens’ Richmond Hill High School students fear for their lives as serious fights break out on campus 

It’s becoming the school of hard knocks, and a safety agent union leader says students are scared.

Violence erupted at troubled Richmond Hill High School in Queens, with police responding to two incidents involving students — and a vicious brawl caught on tape.

School safety officials said a video students took at the school on March 22 shows a gang initiation with a crowd of students pummeling each other on campus.

Police records for that day show cops responded to the school after two girls struck another girl in the face.

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The victim didn’t report any injuries, but a shaky cellphone video that safety agents provided to the Daily News shows a melee with a mob of students punching each other.

Safety agents union president Greg Floyd said scared students gave the video to agents at the school in a cry for help.