All great in theory, but in practice it gets tricky. Especially when it is the other side who says the same thing and then wants to write the test.

There are ways I'd like to fix winding up with MTG's in congress, but arbitrary tests aren't one of them.

Open primaries, ranked choice voting, repeal the limit on # of congressional seats. Fix gerrymandering.

But if after all that a district wants to vote in a semi-conscious grapefruit, that's one of the warts of democracy that we have to accept.

All that said, I could see the citizenship test being okay, but I really don't think it would keep out anyone except for people with enough of a learning disability as to be unable to be coached for it.