Maybe he isn't a reader, but, if he is receiving speech...I would investigate further.
What did his teacher say to you last yr about these concerns? Did he receive speech or any other services during the preschool yrs? Is he under a 504? Does he need glasses?
A Mom I worked with last year brought her daughter to a vision screening w/ my rec. Sight is different. Her sight was 20/20. Her vision was off===and reading was a most difficult task. This girl received vision theraphy all summer and now she is doing great !
Children with sensory issues are in sync one day and out of sync another day. Most of the kids I have seen with sensory have had speech issues and/or attention issues. A gym might be to over-stimulating to be able to concentrate --for your son---based upon what u are saying.
First, does your child sleep enough? I ask this because a Mom I just talked to today caught her 9 yr old texting (last night) at 1:20 am.
Proper sleep is essential.
Is he getting the proper nutrition? Stay away from artificial flavors, dyes, processed foods, etc...
On the same note, see if the schools Occupational Therapist can rec a sensory diet. If he is not in sync---reading will come more difficult for him.
I am hearing speech issues, reading instruction and probably some sensory issues. When he comes home from school, give him a very healthy snack, have him do some excercises (a jungle gym, jump on a trampoline, place a big excercise ball on the floor and let him roll on it) to keep him feeling in sync and chewing gum will help him focus. The jaw gives sooo much input toward concentration.
Has anybody at the school rec auditory testing? It sounds like an outside full evaluation needs to be done. He is 8. The academic challenges get harder in the upcoming yrs.