There are several books and a few software CDs available. Try Transair, Pooleys, Flightstore, Amazon et al ....
Let me google that for you
Or is it true that you are just not allowed to publish the exact exam questions that are in the exams??
That would seem to imply that you believe there to be a central, official database of PPL questions. Well, there ain't!
Cheers
Whirls