I to did Gen Nav in 2005, failed it the first time, passed the second time around
with 20 min to spare at the end! What I found worked for me is I did the exam in order, if I was on a question for to long I would skip it and come back to it.
I used Bristol GS Question Bank and Forum. If you don't understand a question,
write it down step by step how to get the answer, don't memorize the QB answers! Keep practicing Bristol GS QB.

I did Gnav twice and both times there were plog questions , neither of which was the same as the QB values , be careful .
F.L Whoever is doing oyur GS will be able to provide you with all the details of exactly how many questions there or thereabouts you will get on each exam , it was 54 on both my papers. It is also on the CAA website.This does you give you a lot more scope than you will get when you take M and B with only 23 questions

Thanks maxdrypower,

M and B sounds like its going to be fun with only a few questions! No room for errors!

Yes, Mass and Balance can catch a lot of people out.

Only 22 questions, and likely to get a few 2 or 3 mark questions leaves very little room for error if you get the big ones wrong.

Knowing where to start on a question saves a lot of time, so go through lots of practice questions.