Don't know of any websites, but the PPL Confuser is invaluable (Bought my copy from Amazon).
The PPL confuser is an excellent tool for testing your knowledge/Understanding as well as getting used to the format of the exam papers.. . . .There are a few errors in there but if you've done your studying they stand out as cock-ups.
My approach was to study the Trevor Thom books and then take the exam in the PPL confuser, this highlighted any gaps in my knowledge which were promptly put right by a revisit of the Books and/or AICs.
Good Luck with the Studies. .Cypres
p.s. There is also am IMC Confuser as well, I've bought the sucker but haven't had a chance to use it yet!.