I was relearning acts and prove the other day. I try to forget that stuff as fast as possible, it is pretty stupid. The acronyms represent things of imaginary importance, and they don't even parallel the key words so it is more confusing than helpful:
A- Assume, that is always a stupid thing to do. Also, they don't really mean it anyway. Under the 4 rules system they actually mean all guns are always loaded. By the Northern Bureaucrat system only believes it for two more letter, until it gets to the PROVE nonsense.
C- Control - the real thing here is the muzzle with an M. There are several things one controls.
T- OK trigger isn't all that bad, though anyone with a clue knows that if you want someone not to touch a trigger with a finger, you don't emphasize the trigger part. The focus is on the finger.
S- "See" is a weak verb, and not related to the idea of PROOVE. and on it goes...
Your problem as a presumably competent person is to master the nonsense long enough to get out of there.
Speaking seriously, the Canadian system is essentially designed for people who don't use guns, but play with them. It is about static stuff, conceptually, of course one has to cram the basics in there also. The US 4 rules system, and potentially the military system, are built on the idea a person might not just be transporting arms, storing, picking them up for the first time with no knowledge of them, etc... It presumes self-defence, hunting, police, or military. So that environment needs to be real. No BS experts sitting around a table making up rules so the system is complicated. It presumes probably a minimal number of gun types and ammo types. Not a lot of stupid rules on transporting. Not a lot of BS sessions with guys passing their guns around to everyone else to see the latest shiny thing. Not a lot of idiotic rules for crossing fences. 99% of real gun safety comes down to just not pointing the gun at anything you aren't willing to destroy, that is pretty much it. .
So yeah, you need to forget the sensible stuff and memorize and visualize the purpose of the stuff that will be on the exam. The system makes sense once you realize it is mostly created by people who don't shoot, for people who don't shoot. But when they do shoot they draw attention to themselves by: Blowing themselves up by dropping extra shells into their shotguns; shooting each other crossing fences.
The one place where I do see difficulty with different types of gun is the making sure the barrel is clear stuff. How do you do that with a colt saa? A lever 22? A pump shotgun. Lining the barrel up with your eyeball is apparently not always the right answer... The first 4 parts of PROVE are pretty obvious:
Point the firearm in the safest available direction.
Remove all cartridges.
Observe the chamber.
Verify the feeding path.
Anyone who saw a cowboy movie could do that with a SAA, but the examine the bore part is tricky, particularly if you exclude methods that would not be practical when done 100 times an hour as the rules elaborate, and given that it begs to get you in line with the bore somehow. If you use a rod for instance, you will almost certainly be pointing the gun at a body part, and you will not really be examining the bore, just ensuring nothing the size of a marble is lodged in there. Of course, with some guns like doubles, it is easy.
(I looked at some silvercore videos on youtube, and the guy clearly did not point the gun in the safest direction possible, and he pointed the gun at his hand several times while still possibly loaded, in both the SA video, and the 1911 video. In the SA video he does not unload it, it is already unloaded. It would have been fun to see, because he would have probably pointed the gun some degrees away from the required direction in order to drop the cases. In fact he did that to chamber check it also, by pointing it down. It all looked professional enough, just hard to stay within the lines)