It was almost military-like. Standing up when a superior (teacher) walkedä in. Greetings (e.g. "Good morning, teacher!") were mandatory and the entire class would say it in unison. You always asked for a permission to speak. You did not leave the class until you were dismissed by the teacher.

You were punished if you forgot books or hadn't done your homework. Your mouth was washed with soap (really) if you cursed.

Back then nobody had ADHD or exhibited chronic bad behavior.

Most important of all, the parents didn't make excuses for their kids or tried to get special rules for their "special kid". Everybody was treated the same.

If you got good grades or the teacher commended you, you KNEW you had done a good job. No participation trophies back then.