Dear, you must be able to understand concentration, attention span, recollection and distraction. If you are able to watch a movie for two hours continuously, if you are able to play a game for an hour, then you do not have any concentration problems. You can't be attentive towards your studies because you are not interested in it. You are able to watch movie and play game because you are interested in it. Human cannot be attentive towards anything for more than 10 minutes. Then you should study in such a way that your attention is continued and make the subjects are interesting to you. Effective learning techniques should help you. Recollection depends on anxiety
and other physical and circumstantial factors. Distractions while studying are plentiful. You should be able to overcome distractions or avoid distractions. Please understand the above. Change your study style and attitude accordingly. Please post a private question to me and I will help you with" effective learning" techniques. Please quit smoking
. Take care.