That's the first and maybe second year. You can't tell me you haven't done anything in the other decade you were there.

Biology is famous for being only about memorization, but there is something in every subject. Grammar rules, vocab and poems in the language classes, laws in physics, philosophy has a bunch of concepts. What else are concept names in CS if not simply terms to be learned?

The point is however not only to train you how to learn or to get you to know facts, but most importantly to learn the tools of a subject and to let you be able to see abstractions. You need to do a lot of arithmetic before you can grasp analysis. I can't think of explaining mathematical models to a person who never got to use Numbers. A lot of things can only be learned by doing them.

Do you want to tell me anything you learned past class 6, can be learned by doing the activities you listed? It feels very weird to hear from people on the internet (who I think are adults), that they never moved on from being ~7 years old. (Sorry, that was not intended as an ad hominem, maybe you are a professor in X, but how can you explain, that you think school can be substituted by e.g. selling lemonade, past primary school?)

The alternative is that you are a modern da Vinci and could invent all of modern science yourself. In this case congratulations, but maybe you should have gone to university earlier. You would however realize that most people aren't like that and do learn more then selling lemonade at school.