I need a quick tip as a finance major?

I am a finance major in my last year at a University. I've been ping all my cles but I have 5 more cles which I have to take but they're going to be a lot harder than any other cl I've taken. The problem I have is I completely have forgotten almost everything about the major since I have taken a year off and I don't know where to find information to recap on!! I've went to public libraries, school libraries but none of them give me more than the general information. I've given all my books back and I am not financially able to buy more books at this moment. Anyone have a link or any type of advice ? I am open to anything!!