I dont think there is one (official) out there yet. K and B are trying to get one out i hear. The target date seems to be may next year. But thats tentative
You also do not state which SCJP you are taking 1.4 or 5.0?
If you are taking SCJP 1.4 then Dan Chisholm's excellent mock exams are available in book form: here [ September 09, 2006: Message edited by: Barry Gaunt ]