As I am studying daily for 15 hours a day when classes are going on my mind is particularly focussed on the first thing told by teacher and thinks abut the only first topic told by him and after some time I then realise that the class is going on and I miss the other topics told by him.
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Doctor Answers (1) on Concentration

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Harisha N L Bangalore | General Physician
Vitamin B-12 helps maintain healthy nerve cells and red blood cells. A vitamin B-12 deficiency — common in older adults — can cause memory problems...consult physician get yourself examined if any medical issues they will help you other wise you can consult psychiatrist they will help you
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