European Comedy Early 1980s (Solved)

I think the language was French. It was like a European version of Porky's.

It was about several students who knew each other, and the things they did.

One of them was really old, and when he graduated, he also died of a heart attack.

The other one did something in the chemistry lab, and the school exploded.

One of them was taking a test, and his father connected his son's arm to his via remote control. His father could see the test from a van. All of a sudden, a fly got into the van, and he started moving his arm to buzz it away, so his son started moving his arm while taking the test.

That's all I remember.