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Has he chosen a Course of his choice. He could be having stress
issues with School, Friends or at Home. Does he have any trouble sleeping. Any change in behaviour, how is his mood most of the time. If it is just difficulty in understanding he can take tuitions for better understanding of his weak Subjects. If he has any of the above problems he can try to sort it out with those who will help him, if not he will need to consult a Psychiatrist
to help him deal with issues bothering him.