I'm new here, so I don't know the system very yet, I mean how you all find these questions and stuff, but I got a little suggestion here:

Have you read the book "the art of problem solving " by Paul Zeitz? well I read it many times and its pretty good for anyone who is interested in knowing maths. So why dont you try it? Some of the solutions there is so simple that you couldnt think of it when you see so hard a question!

Well maybe you have read it, but as i said, this is just my recommendation...