Student as teacher and a students

In case of this sassion you might have seen that a student who teaches and already reads himself. Such type of case always gets in many fields that while teaching something to someone we teaches but in that time we learns also . Its a very good matter for a student who studies and teaches also .His teaching becomes milestone in many fields like in some compatitive exams, while ,mathamatical operation , or in the case of General knowledge Because whatever we teaches to the students It means that we are specified about those which we are teaching to the students during this time if we get some difficulty in learning so we can use the study medium like books and other medium . so by such type of way we can teach them and learn from them.