PPL Nav is fairly simple once you've got to grips with the whizz-wheel. Plan a flight from A to B via C, possibly diverting to D. Remember a few simple facts about symbols you might see on the charts, work out angles to get back on track using the 1 in 60 rule, and finally five very easy questions about radio nav. I remember posting some more detailed stuff recently, but that's most of it.
Evo (100% in PPL Nav....
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QDM - caution! Some exams (e.g. Met) are nothing like the Confuser. Others are identical (e.g. Human Perf.). Your milage may vary, but if you only work with the Confuser you may fail some...