I don't know what your college experience was like, but for me often the informal aspects and hitting the books was more useful than formal lecture classes (lab

I don't know what your college experience was like, but for me often the informal aspects and hitting the books was more useful than formal lecture classes (labs are a different story ofc). Tutoring by grad students / teaching assistants was good too. University sanction is a high bar for something that is organic. The reason for this is somewhat obvious: people don't retain and model complex information easily from just listening. They have to process it, interact with problems, and talk about it with people.