It’s a great idea, but the only traits worth discovering cannot be isolated through the use of a written exam.
You want to find people with the trait of altruism and eliminate people with the trait of seeking self gain.
It’s quite difficult, because people with covert psychopathy learn early on to conceal their lack of emotion and their self-centeredness. Others often describe them as model citizens.
You speak well, and it is not lost on me that no written exam will weed out liars.
Yet it has the salutary effect of informing a candidate that those whom he/she deigns to serve are watching, and this his own words are available for public perusal both before and while in office.
Public office should require a test more strict and philosophical than you endured to get a driver’s license, no?