I was sceptical as I read the title but it turns out I'm already practically doing the same thing. Only instead of using printed out study guides, I load them up on my smartphone. This way I never waste any time waiting for anyone or anything. I'm always learning something.

However, this doesn't work for every kind of material. It works fine for classes like History and Law but it doesn't work quite as well for Pure Mathematics. That all from self experience, though.