Genesis once bubbled...
and as their "buddy" I can't help them with the test.
I can, however, be their dive buddy.
As their dive buddy I'm not expected to help them with the test (after all, were I a student, I would not be expected to do so either!) All I'm expected to do is be their dive buddy.
What's the problem with that?
You want me to sign 27 waivers disclaiming any professional (e.g. DM, etc) relationship between you and I? Cool - done.
So where's the problem?
No, I'm not an instructor. If you want to "qual" me as a diver (assuming you won't accept the printout from my dive computer showing my recent experience) that's cool - bring your tanks and gear and let's go crank up the boat for a dive or three. I'll even treat on the fuel - just check the attitude at the dock.
The problem is that all of the other students in the course have not signed off on such a waiver. Your waiver does not absolve me of the requirement to stay within ratios established by the certifying agency.
There are a few skills which must be done as a team. Each member of the team needs to be evaluated as to their respective roles. A certified diver cannot avoid "helping" when they must take an active role in performing some of the skills. Furthermore, the recollection of those skills is often not as good as the certified diver might imagine.