I've met plenty of average people / mediocre performers that probably test worse than their other performance, but I've never met an exceptional performer that

I've met plenty of average people / mediocre performers that probably test worse than their other performance, but I've never met an exceptional performer that was a poor tester. I have met some exceptional testers that were poor performers due to personality issues. Tests have issues, but in general, the statement: "if you're a "bad tester" you're not an excellent performer" is pretty true. The caveat being that, IMO, most of the time, institutions are using the wrong test.