I'll make a suggestion. Now, I have to say that since all our difficult children are different it may not help. But, what really helped my son was a schedule. Back in second grade we worked really hard to get him on an after school and bedtime routine. It really helped. It took awhile for him to get the hang of it or stop playing, watching tv, gaming, etc., to do his homework - but after awhile, he just settled into the routine.
Now that he is in 6th grade, it's the same routine. A structured homework hour that starts at the same time every day. I review the homework first. If it's something that he can work on by himself, he does so. If it's something he needs help with we sit together. Same thing for the bedtime routine, if it's not a bath night, he knows he's expected to get his pjs on, put his clothes in the laundry, brush his teeth and use the toilet. Then, we will read and talk together which he really likes. If he wants that, he has to do his part.
On Friday and Saturday nights, he's "free".
I'm not saying that this is the be all end all for ending the anger. But I'm telling you that it has gone a long way in our house in providing a more stable and predictable outcome.
I had to work really hard on consistancy, but it was worth it.
Sharon