In regard to the "easy" and "diff" on the WJ-III results page, what level should you generally try to present to your child? (We homeschool him.) Somewhere in the middle? Higher than the middle? Vary it, depending on the subject?

What's the difference between "brief achievement" and "total achievement" on the WJ III? Do either of these indicate the overall level at which the child is working, or is it the level at which he should be working? I guess I'm wondering what the purpose is of these two scores.

Thank you!