ill second Duxnutz comments with doing a course somewhere. I also did a UNSW course (perhaps in his class), however had to study up Flight Planning whilst doing the other classes (perf. systems & nav) during the day. Still got through, so its not impossible, im not exactly the brightest spark about either. A tip that i wish i took was, get a calc thats identical to ASLs. I was so used to mine which is relatively new and has a nice screen that works like a memory function. I was constantly finding i was making little figure trouble errors with my calc during the exam which ment eating away at the precious time remaning
Good luck to u guys/girls still bout to sit it. I have a bonfire to light