According to what you said, it should be against the internal management regulations of driving school for coaches to drink alcohol during driving training. But as long as the coach does not drive, it is not illegal.
It is illegal for anyone to hit someone, and if it constitutes a minor injury, he will bear criminal responsibility.
You can call the local driving school to complain. You can also complain to the Traffic Management Bureau. You can also call the superior competent unit of the driving school to complain.
I hope you can adopt my answer.