Get to the exam centre on time. I got stuck in traffic and got into the exam centre half an hour late, failed with 67% :-(
Nailed it on the resit with 98%.
Maybe I'm technically minded or something but I really enjoyed GNAV, sometimes if I struggled with something I just went over and over it again and it evntually clicked and became second nature.
TBH I thought I had got 100% on my resit I felt that confident about my answers, was gutted when I got my result of 98% and that was after studying at the infamous, now defunct GCNS.