It is so random. We scheduled the WISC when it was practical that meant this past week, right before school started. I had no idea what age brackets they had, and thought that she'd probably be in the middle of one (between 6:6 and 6:9), or just starting one if they did every 6 months. She turned out to be a couple of weeks shy of the 6:8.

Anyway, I don't have the scores yet, but it is so random that the results would probably have been lower (slighty I suppose) had the test been a couple of weeks later.

Very interesting in the Coding section. I can't think of anything in which an advantage of 2 full years is not significant at that age.