Get rid of them. There is nothing in those books that you can’t find on the Internet. If you decide later that you want to seriously read one of the books you discarded, buy it again or get it from the library.
I’ve been on Adderall for only a week, but I have noted one change: When I get distracted during a task, I’m much more likely to be able to go back to it, rather than forget about it entirely. It’s too soon to say much more than that.