I did GNAV exam at the beginning of this month (October). I was very surprised at the questions. As far as I can remember, this is a (very) rough break down;
* 01 polar stereographic question, converting magnetic to true, then grid course. But trick in question was most people including me put outbound grid course. They were asking for VOR radial. Therefore I should have taken the reciprocal of the track!
* 01 conversion angle question that I remember. No convergence questions. No using departure formula questions.
* Plenty of crp-5 questions using whizz wheel, working out winds, true tracks, cross wind components etc
* A few performance type questions, rate of climb, true altitude etc
* About 10 plotting questions on the ELO1 or 1A chart - basically the chart with Ireland on it
* Can't remember any INS questions. But can't be sure of that. Just remember being very suprised at performance type questions, lack of p. stereographic, c. angle, and convergence type stuff
Best bet, be as prepared as possible as I found it completely not what I was expecting!