Ritalin can exacerbate aggression. The stress of exams may also be getting to him and Ritalin can (but doesn't always) exacerbate anxiety which he may be displaying as aggression.
Whether or not to change to Concerta is a decision to be made with his neurologist.
I cannot stress how important it is that he see his neurologist as soon as he returns. I wish I could offer something more proactive at this time!
Best of luck,
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