Past papers aren't too bad. When you do a bit of them, you'll soon get used to it and it'll be much easier to do
Remember for the longer answers to check the marking criteria, some of them are pretty dodgy... I'm doing pretty bad in 3U, but I know it's mostly because of my lack of work and practice once again >_< Not sure which one is worst, Maths or Physics lol For English I'm not too worried at the moment, mostly I just make stuff up xD