I have tried the Qs before my exam, they're ok but remain the same for past years I believe (I've tried 2005, 2006, 2009), the only difference is that older versions have 50Q and newer ones only 48. The style of the Qs is shorter than current ones I think, so relatively speaking, I think it's easier.
Wikitestprep has the explanations and score estimator, so just google it. It overestimate mine like UWSA, but still good practice.