From our experience the quality of basic PPL ground training has nosedived in the last couple of years, it is normal to find ATPL candidates who cannot use the CRP5 and who don't know the difference between heading and track. We spend a lot of time teaching stuff that really should have been covered in the PPL.
For the exam I would agree with timzsta, you need to be totally comfortable with the CRP5. Don't expect very much Polar Stereo stuff, the plotting is easy peasy, usually VOR/DME fixes on the Jepp airways chart that covers Ireland and you can expect a few 'mensa' type theory questions. Good quality feedback can help with this paper because the oddball questions do seem very odd until you see how to solve them.