Gulf,
I am currently studying for my last two exams (Nav and Flt Planning). Having passed all the tohers under the old regime, these last two are to be taken under EASA. The old Confuser, IMHO is not going to be any use to you now, as the questions have radically changed. Lots of them are based on CPL/Atpl questions.
THere is no PLOG or chart in the Nav exam now, purely questions on how to use your Whizz wheel in all its guisies, radio Nav, Q Codes, GPS, chart projections, lat and long calculations, time calculations and magnetic compass. Believe me, you NEED to study in the books i'm afraid. Now there is no shortcut (believe me, if there were I would use it). BUt look at it this way, in the end you will be a better pilot for it. Use Airquiz, but ONLY for practice. Do not learn jsut those questions as they are not the real ones.
Hope this helps
GQ