The behaviors you describe suggest a possible Attention-Deficit/Hyperactivity Disorder. Have your grandson’s parents explored this possibility with their family physician?
For some students with writing challenges, the thought is, “Oh my goodness, if you’re having difficulties with spelling, why not just talk to your computer?” The challenge with talking to you
This transitional time can be particularly difficult for people with LD, because they are no longer receiving the support of special education or accommodations.