I usually understand the answers when I see them these days, unless they're really obscure and/or they use some data that I just didn't know... it's making the mental leap to get from clue to answer that I have trouble with. So I guess what I need is not so much learning as practice.

Thanks for the r.p.c pointer though -- looks interesting though I don't know if I'd dare actually post there for fear of being shouted at for being stupid!