Watching your son struggle must be very difficult.
Although he was assessed a few years ago, the results would be outdated now and therefore a second assessment is necessary; an educational psychologist is probably best for this; you may have to request a full IQ test specifically, rather than one measuring academic performance.
Once you have the results of the IQ test you can (if needed) take this report to a neuropsychologist who will be able to provide some insight (through further assessments) as to the reasons behind your son's performance.
An alternative would be to take him to a neurofeedback therapist who are able to map the areas of the brain being used for certain tasks. This is an alternative therapy and I am not sure how many medical aids will cover this.
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