Try braking it down. Take the questions you got wrong and brush up in those areas and figure out WHY you got it wrong. Usually its just a misunderstanding of a basic concept. You will find that it all starts to slot into place, at that point you are ready for the exam.
Or just nail the feedback to death! (but please don't sit on here whining when you fail an interview because you look like a crap pilot who can't explain something fundamental)
P.S. How many times do you have to ask if the Bristol feedback is any good?
