Reply #1: I remember when I took driver's ed when I lived in Arizona. What we did was to

[ejpoeta]

use simulators to 'drive'. I did great!! I did awesome!! When I took my final, I had to get a 38 to not get an A. I was the worst driver there was when I finally got my license. I got into a lot of accidents and it took me a long time before I became a not horrible driver.

My point is this.... You can test and use all kinds of bs parameters to judge someone's ability at something. But there is no test that will show you how good a teacher is beyond them actually doing it and gaining experience.