DS has taken various achievement tests and scored at a high school equivalent at really young ages, like second grade. He did fine with a 3 year acceleration but I would not have gone higher than that. Basically in first grade he was learning things like long division, operations with fractions and decimals, etc. and by third grade he was learning middle school math. I think many high school students are just not very good in math, and still struggle with elementary concepts. So a gifted third grader will look like an average high schooler, even though the third grader would not be ready for a high school curriculum. Just goes to show how bad math education is, that so many high schoolers score so low and can't even understand elementary concepts..
Beery VMI has a few different scores, one of them measures "motor coordination", another measures "visual perception" and another is "visual motor integration". It's a lot of tracing, copying patters, manipulating small objects while being timed, etc. DS always does very well with visual perception and horrid with coordination, and he has a diagnosis of Developmental Coordination Disorder. His overall score averages out to be fine, from what I can recall, but the motor coordination subtest is really bad, like a standard score of 65.
