Tiram, My Oxford instructor told me that for the navigation general exam the examiners use the Pooleys CRP5 whizzwheel to set the questions. If you don't have one of these you will get the wrong answer (or the half and half) answer.
Oxford do (or did) a super whizzwheel interactive CD for the CRP5.
For the other exams, don't learn the feedback! Recently, the exam question banks have been changed and there are new questions. Advice I weas given is to try and work out what learning objectives the fedback questions concentrate on and make sure that you know these parts of the subjects. You can find the LOs on
www.JAA.NL