Well, I would consider 80% or higher to be considered mastery of the material... so scoring that on a pre-test would indicate to me that they don't need to go through that material at all. I'd venture a guess that the average is probably closer to 50-70%, but I'm not a teacher, so that's total guesswork.

If they are working at the right level I'd probably want my kid to be scoring around 60% or so. To me, that would indicate at least a passing familiarity with the material, but with some clear areas they need to work on/learn about. That material, at that point, should be a little challenging, but not frustrating.

~amy