Just to add, the confuser was excellent (I finished my PPL the later part of last year). Do not rely on any of the exam preparation books (Confuser, AFE, Pooleys) for the Nav exam. Most of the questions do not appear on the charts anymore as they are too old. I only found one set of question in the confuser that I could actually use for Nav as all the airfields they referenced no longer existed.
Confuser is almost spot on (in some cases word for word) to the exam questions.