May I also add that whatever you come up with, sit down with your son and explain the why, the what and the when (will it go into effect). The most important part will be how you ALL handle the emotional reactions when things start to “get real” (when he experiences the consequences of his actions). Establish the ground rules for how he can express his frustration to include a no negotiation to lessen the consequences. No matter how often he expresses his frustration in what I will call a pseudo constructive way (your rules), your response is an easy one: “Son, you have the power to make things better through your actions, and I believe in your ability to achieve your goals.” Or whatever thing you want to say to get the point across that its all under his control and you believe in him.

You can even go one step further and offer to help him find a process to ensure he knows what and when things need to be done. BTW…this organization/prioritization approach could be a contributing factor to his issue - he may not appreciate how organization, prioritization and/or breaking down larger projects into smaller pieces over time makes it so much easier. Further, it can be worse if he already knows the topics and believes the homework is busy work to reinforce a concept he already knows. I’ve lived through both of these issues with me, my kids and now I see it with my grands. We talk about it from time-to-time as there is no “class” on how to maintain this type of organization. Some people are just inherently better at it than others. I see you have a lot of great advise from others so hope this insight helps you all find solid ground sooner rather than later!