Donald's reading level is about two years behind his age group. he also has some difficulty with arithmetic. it is probable that donald is suffering from

It is possible that the child, which is Donald, is suffering from Dyslexia.

Dyslexia is a case wherein a person has trouble matching the letters that they see including the sounds that those letters and the combinations it makes. Dyslexia does not choose age. It can be suffered by an adult or a child. But, we must take note that Dyslexia has no connection to the overall intelligence of an individual dyslexic person. Yes, they have difficulty in reading but they have the intelligence to be a much better reader.