With a slight alteration, I would accept your sequence. It is important to remember that the affect interest-excitement (i-e)allows us to focus on a subject for as long as that affect is maintained. Healthy, normal study requires prolonged attention (i-e, usually, although sometimes fear of failure, which is shame-based) that allows us to use the best part of our neocortical system. Since I postulate an interference with i-e that causes physiological shame-humiliation affect (s-h), there are more-or-less constant interferences with i-e and therefore normal attention and therefore normal neocortical work on the problems being studied. In that sense, then, children with ADD/ADHD cannot study effectively because they cannot concentrate for longer than a moment or so, and it is this interference with focused attention that prevents both memorization and process learning as seen when you do math homework.
The problem would be more generalized than not, I suspect. Do you know any psychological studies that suggest a reduction in childhood memories, especially of classroom activity, or reduction in the ability to memorize, in people with ADD/ADHD?