An occupational therapist would only be necessary (in this instance) for fine motor skills and if he struggles with poor muscle tone. From your post it appears he is struggling more with academic components of reading and maths. If I have understood your concerns correctly, it would be beneficial to take your son for one on one remedial or extra lessons in the areas he is struggling. I am appalled that the therapist he was seeing gave any verbal comparison of two children - this should never be done.
If you are able to assist with additional lesson personally you can do this too.
It is important to remember that ADHD is present from a very young age, regardless of when it was diagnosed. This means your son may have missed out on some foundation skills prior to being put on Concerta.
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