Possibly. It might weed out some bullshit artists but would also penalize folks whose most recent tests involve doctors and bodily fluids rather that calculations and regulations. Hell, the hardest test I've taken in years is at the optometrist... Some "test anxiety" would be present, I'm sure. It would be embarrassing to forget how to work formulae that are part of our automated or app-based work flows and flunk a test.But wouldn't that tell us something extremely important if they did? (I say quite facetiously)
That said, certification is something viewed with favor by insurers and regulatory bodies. Anyone on the fence about taking training or just sitting for tests should keep that in mind. In some locations certifications are already required for certain crafts; it's a matter of fairly short time before requirements arrive in places they do not currently exist.