This may, in some cases, be medical.  
He has a job this summer in a law firm--really my friend is doing a favor, but he's excited about beginning.
 Excellent!  You may wish to coach him to 
- keep a private log or journal of his daily duties (as one would typically need to do for an internship),
- write a weekly essay on something which he has learned,  
- research action verbs (such as this list from 
about.com), 
- polish his descriptions (to a form one would typically use to present themselves on their resume or curriculum vitae (CV)),    
- proactively purchase a journal or notebook, ring binder, project box, file, or some other means of organizing/containing/keeping his work.  
He is definitely going to need an administrative assistant.  And a highly organized wife. 

 Some may say that a focus on remediation is, at age 12, a more solid plan than establishing requirements for future supports and accommodations for his career and marriage.   
