Does anyone know what this test measures, exactly?

I see that according to the test results of my ds it measures "motor and perceptual skill, encoding and retrieving nonverbal information from memory."

I've been so focused on the WISC and WIAT results that I hardly noticed this one.

These are issues where my ds seems to have a lot of trouble in real life, but on this test he scored 98.6 for the "copy phase" and 99.83 for the "recall phase" "although he stressed, before starting, that he had a bad memory and had probably forgotten them all" (quote from the narrative) (poor baby)

Should 2E kids-- ADHD in particular-- have a problem with visual memory?

Thanks!