Our virtual academy uses the primary test for grades K-2 and the secondary for grades 3-12. I read someone else said their school used the secondary test starting in 2nd grade. I wonder if the difference is due to regular vs. gifted school/program.

From my son's test, it seems to me that the primary test can handle up to regular 4th grade questions. The only reason I think that may be is that my son's reading test scores came out the same and are at a 4th grade level. What I saw of the primary math test seemed to stop at about 4th grade as well. That, plus the fact that he's above fourth grade level in math and it underestimated is abilities. So, if your child is above 4th grade in language usage, reading, or math it may underestimate their abilities. At or below 4th grade and it might still be accurate.