Not sure if you tried it but try and get the PPL Confuser.
It seems to be out of print (can't confirm this though) but I'm sure you can find a copy somewhere.
Invaluable and the questions are along the similar lines to the exams, or at least they were twelve years ago. They have been updated since so I'm sure the sample questions are still of a high standard.
I didn't use the AFE books (I presume these are the Jeremy Pratt books) but instead used the Trevor Thom series. Both series of books are pretty good but the confuser is great for practice exam questions.