He's done a couple problems, but this is his second year taking it anyway... so he knows what he's in for.
He does about 30 minutes of problem solving math of some kind each day as part of his schoolwork, not necessarily specific to any one program... but it would sort of count as "test prep" -- they all overlap quite a bit!
Now if he does well on the 8 I think I probably will sit him down with a few of the past years' 10s just to see where he falls on that. February is busy already, so I'm hesitant just on that count!