Thanks. And sorry for not posting sooner. I think the best tip to give to you both is definitely use the practice material. It was quite evident when I was there that some people hadn't and they seemed to struggle- for example the part(3) of the SCAAT can at first be a confusing concept so don't let that be the first day you come across it. Also, they highly recommend that you don't use the technique where you have to find two shapes and you look for one shape at a time- I think you lose too much time doing this method so unless you really struggle, I would try to find both shapes together.
Interestingly, the charter that you should have read before and that you sign clearly indicates you should be dressed smartly; nearly everyone at my day were dressed smart.