This kid is not generally motivated to achieve anyway - he will spend hours on a new interest at home but whines about schoolwork that should be a no brainer. So the teacher wants to meet again formally next week and I'm not sure what I should ask her to do for him. I can tell my son 100 times to pay attention and finish his work but he clearly has executive functioning issues. She already has "work plans" for all the kids so they know what they are supposed to do doing the week and cross things off as they go. I thought that would help DS but he dislikes the work plans because well, they make him work LOL He can't prioritize time or tasks and gets distracted easily.
I agree with mon and dbat, I suspect that your son is having some other issues. Did your private testing include achievement tests or any suggestions for further assessments based on his largely uninterpretable IQ test? It sounds like he has some real output issues but I don't think that you have enough information to determine whether it is dysgraphia or some other expressive disorder. I would not assume that this is all "executive function" issues. Your kid is 7. It is perfectly normal for this age to have minimal organizational skills and short attention span for boring tasks. What I think you need to figure out is why he is avoiding the certain tasks. It sounds like something more than just boredom.
When we were sorting our DD's dyslexia and dysgraphia issues in first grade, she exhibited many similar behaviors. At home, she could spend hours engrossed in a book about sea creatures and even made her own models out of clay or Lego. At school, she looked distracted, unmotivated and avoided doing the work. Her teacher knew that DD was smart and saw her unwillingness to "just write a short sentence" as a character flaw. We knew that DD had an ever-changing, odd pencil grip (which we kept being told would work itself out - bah!). We didn't know that DD was suffering from headaches due to eye tracking issues or that she had dyslexia issues that made spelling and conventions extremely difficult. Her combination of challenges made that "short sentence" sheer torture. BTW, DD's WISC-IV provided no clues re DD's challenges, nothing under 97th percentile. An IQ test alone often is not enough to sort things out with these kids.