Perhaps an Actual Firearms Safety Examiner can moderate my suggestions here, but...
Alright... When I qualified for my PAL last summer, I "challenged" both tests consecutively on the same day; so, I've never taken the Canadian Firearms Safety Courses; but, I'll give you some advice for the PROVE sections.
Be slow and cautious... being able to field-strip a 1911 in less than 5 seconds is no excuse to attempt to show-off during the test! Attitude is very important; and so is making sure that your examiner doesn't miss any motion you make, since everything counts. Think of the test as an exhibition, as if the examiner doesn't know anything about the proper procedure and that you're instead instructing a neophyte in the principles of safe-gun-handling.
Know your actions... there are some odd-balls out there that either don't have a manual safety, or can't be PROVEn with it engaged: you will be deducted if you don't try to engage the firearm's safety; so...
Give a play-by-play commentary... talk through the PROVE sequence for every firearm you manipulate, and state aloud when you have determined that there is no manual safety device, or you can't locate a manual safety device (helpful to regurgitate that "manual safeties shouldn't be trusted anyway" in such a circumstance), or that you have engaged one, but that it is inhibiting your progress...
Ask questions about the circumstances... there's no stipulation that you can't, and the examiner will tell you what he can, and keep his mouth shut about what he can't.
Be prepared for the unexpected even if it isn't likely to happen... That is a healthy attitude, in general. I went into the test relatively blind, and had no idea whether the examiner was 'pro' or 'con'; so, I studied my manual heavily for a few weeks, and tried to imagine the various ways I might be induced to inadvertantly trip-up... This is a good exercise, even if you know your examiner well; since, out-in-the-feild you may come in contact with some ya-bos at the hunting-camp or department-store who are mis-handling guns; and, you should be prepared to politely-but-firmly diffuse the situation without committing any faux-pas yourself.
Personally, I believe anyone who looks down the muzzle of a gun without a *really-good-reason* should be failed (since doing so blatantly violates the fundamentals of 'pointing the gun in a safe direction' and 'treating a gun as if its loaded all times'); so, I said so at my test, and asked for a bore rod to verify there were no obstructions in the barrels of the guns I was proving, and I was gleefully provided with one (it seems my examiner was of the same mind). I did get dinged for not engaging the safety on a single-barreled break-action shotgun, and when I professed that there 'was no safety' I was told that I 'should have said so' during the test. Nonetheless, I averaged over 97% in all sections, but I got 100% on my Restricted Practical.