There is another 'Confuser' type book, by Jeremy Pratt of
The PPL Course fame, although I have neither used it nor seen any reviews of it.
See this link for details:
http://www.afeonline.com/shop/produc...roducts_id=217
I used the 7th edition of
The PPL Confuser by Nung Sornying, but found a number of mistakes in the book which were rather irritating - perhaps later editions had better editorial control.
Hopefully somebody who has used the Pratt revision book will be able to comment upon it.
Whichever book you choose - good luck with the studies