Remember that your son is thirteen - a certain amount of defensiveness is normal for the age. Thus, the appearance of such behavior in itself is not unusual. I'm not suggesting that you should let it go, but don't worry too much about the fact that it is occurring. The frontal cortex of the adolescent brain takes some time to develop, and certain of the skills you mention are tied to that development. All else being equal, this will come with time. For now, build in some supports to assist with organization and with adherence to tasks. For example, to be sure he is recording all assignments in his agenda book, have the book initialed each day by each teacher. In this manner you will not be left holding the bag, so to speak, by not knowing what the assignments are. Once you have the information, you can monitor completion of the assignments at home. Many parents assume that when children reach middle school years they (i.e., parents) should refrain from monitoring the work. But children this age often do require such external support. While some of the symptoms you describe are typical of children who display ADHD, if this were the case with your son it likely would have been discerned earlier in his school years. So I'm assuming this behavior is more related to development than to anything else.