Once we are out of school and college we spend the rest of our lives trying to undo what school and college did to us.

School teaches us memorising paras. Life wants us to understand things.
School prescribes a conventional career path. Life shows us most success is created unconventionally.
School wants us to follow commands. Life wants us to be curious. And break some norms.

The best thing to know about school and college is to know that life is our biggest school, which only begins once the formal school and college gets over.