Thanks all for all the feedback.
Heston... great. I'll sure work out some mock exams/problems before taking the exam. Piper's suggestion to get an app to double check your calcuations sounds like a good idea.
Piper... a higher hour student gave me similar advice. However I haven't yet bought the book for Aircraft general/flight planning. The nav calculations seem simple enough and the wizz wheel doesn't look like rocket science so I might pick Nav after all... if I find it too hard I might rethink my decision.
Gemma... yep you're right. never really thought I could fail the medical test (I'm only gonna do class 2), but you never know so I should sort it out soon!
Trident... agree, airlaw was a pain. I've always had trouble with memory type exams. I did that subject first thinking if I manage airlaw I should be ok for the rest!