from what I have heard, you are after the CSE if you want discouragement, or NEAP 2010 works fine too.
Haha! my teacher said it's a total pain and that I should leave it till last. I started doing it cause I mistook it for another trial and actually finding it pretty easy so far. Got 18/20 for the multiple and half way through short answer with a mark lost on 2.e, but not even sure tho, it's just different from the answer at the back.
Finding TSFX multiples pretty easy so far, got one wrong so far...
NEAP which I got from this website not long ago I'm finding fairly easy atm, did almost perfect on multiple and got full marks on question 3 and 4... haven't bothered starting the rest yet