Hey freshveg,
I'm a bit of an old timer as I originally did stage 2 almost a year ago...! Assuming the format is the same then it is just the pilapt test and the maths one at stage two. No psychometric / verbal or anything else like that. The maths is fairly straightforward if you have all the time in the world and no pressure, but the time constraints are what make the test quite tough.
There is a brief group discussion, can't remember what the topics were on offhand but it's nothing you can revise for, just be yourself!
Hope this helps,
James