many a times students come across a Problem of lack of concentration during class in school or at tuitions . Well concentration can be effectively improved by one simple habbit of having a glimpse of the topic which your teacher is going to teach you in the next class. This way you will be in a state to correlate what you had studied to what your teacher is teaching and what all points you had missed while slf studying. There won't be any chance that you miss the topic due to lack of concentration and believe it really works.
best wishes...