It is harder and harder to concentrate on it for it, and it seems that the more he tries, the worse at it it turns out.
Naturally, it conducts to irritability because the teenager starts blaming himself that he stupid, does assumptions that he does not have enough mental capacities to perform this work.
Can imagine as it influences its selfassessment.
Dreams in reality.
Deterioration of attention influences behavior of the teenager in a class.
At first it, perhaps, will also be capable to concentrate on work during almost all lesson, distracting only for some minutes in its end..