Many parents fell they should give their children a break from their medication during the school holidays and/or weekends. From your post, it seems your son's behaviour and general feeling toward himself may improve if his Concerta is maintained daily.
Althougg it appears that increasing the dosage is the logical step when his marks have dropped, if the doctor is concerned about aggression and irritability, these effects may cause his marks to drop even further.
An educational psychologist may be able to provide your son with some coping strategies on how to cope in a situation of conflict to calm himself down and find the right words. Similarly, at home, a strategy must be in place that enables him to take the time to express himself well in each situation without it becoming escalated due to frustration, and without the incident being forgotten because too much time has lapsed.
Perhaps implementing coping strategies at this stage would be more beneficial than increasing his dosage. With these in place it may no longer be necessary to increase the dose, alternatively he may be in a better position to deal with the added aggression.
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