can't study well....

Dear Doctor,
It's for my cousin.He aged 24 and height of 5ft9' and weight 60 kg.He is student,doing his graduation,actually completed his course but he isn't pass yet.He is very good in studying till 12th level.In 10th he has 95% marks and 12th he has 90%.But in graduation he has full of back papers.He completed his course in 2008 ant not passed yet.Every time he applied for examination but he doesn't appear(absent)and continuously postponing things.He join this course with his own interest.He says he tried his best for study but he can't do.He can't get concentration,or interesting in studying.Some time he is weak in memory,can't study a word or sentence.He can't digest the material or will to do it.He often see like feel weak and lazy,don't like doing anything using mind and brain.He wasted his most of the time in front of computer and tv,using net and watching movies.He says his mind is full of anguish and worries,but no reason for that and he doesn't know that is for what.He has no love affair but he is fond of love. so we are unhappy about him,because he is talented,energetic person before some years.Still he has the caliber for doing but doesn't work.is this has a cure in homeopathy,please suggest.... thank you...