I found the Nav exam the hardest, maybe it would have been easier if I had waited for the navigation phase of my training before studying for this exam. . .Yes the confuser is good but I kept getting one question from the confuser wrong in the flight planning section, In reality I was right and the confuser was wrong found out when that question came up and I plumped for the answer the confuser gave. thankfully I had answerd enough of the other questions correctly to pass.. .The best advice I can give is to read all your study theory thoroughly if you dont understand somthing then ask your instructor. When you feel ready sit the exam reading the questions carefully you should have plenty of time to complete each paper so don't panic.