What should I do with my old school notes?

Hi I'm in 10th grade. I put alot of effort and work into all my cles and I'm extremely organized. I have a seperate binder for each cl at home. All the binders have dividers seperating each section. I'm really proud of all of my work because I have put so much time and effort into school. The problem is that all the binders are starting to build up and I'm only in my 2nd year of school! What should I do with all my notes? I was about to throw out all my notes from my Algebra binder from last year and than I went, Oh! Wait, what if I need these when I'm studying for the SAT? What should I keep and what should I get rid of? I really have no clue. I'm taking a tutoring course this summer to prep for the SAT so I don't really know if I'll need my old notes from last year. I was thinking of taking a few key sheets and throwing out the rest. What about all the other cles? I have no idea what to do and I desperatly want to get rid of some of this stuff! Please help!!!