Purely subjectively, I feel the busy work in school made me stupider, whereas once I've been out and learning on my own, my mind feels better and sharper, and I

Purely subjectively, I feel the busy work in school made me stupider, whereas once I've been out and learning on my own, my mind feels better and sharper, and I'm more interested in learning. My opinion is that two really big factors are desire and free will. People need desire in order to really excel, and they need to think for themselves to quickly see good solutions. Both of those are hard to capture on an iq test.