The split time is incorrect when time which should be best and where little play phone, chat chat friends. For this reason, the impact study results to fall even lower, because they do not intend to study.
The time is not right. That you should study hard and do not play phone, talk, chat with friends. For this reason, the impact on school performance to decline. I do not intend to study
The time is invalid. At that time should study hard and time can play phone, talk to chat with a friend. This causes the impact effect of down. For not studying.