Gen nav is indeed a pain in the arse. It was the only thing i failed but i managed to pass on my second attempt. My best advice would be to do tons of practice questions such as BGS question bank. Also make sure you keep nice and calm in the exam, there is a time limit but you don't need to scream through it in a blind panic as i did on my first attempt, there's plenty of time. Loads of plotting and CRP5 in my exam. Good luck
