Grammar schools, and boy, were they hot on discipline.
We had a geography master whose favourite punishment was to make you stand on tiptoe and press your nose on the blackboard. He drew a chalk circle around the mark your nose left, and told you to stand with your nose in the circle for five minutes. After three minutes the pain in your calf muscles was excrutiating.
I was caned twice, and deserved it both times. We had respect for the teachers - sometimes because of their sheer teaching ability and sometimes because we were afraid of them. We were told that we were their to learn, and and that if we wanted it the best education you could get was available, free of charge.
I look back now and realise that I was extremely lucky.