Butting heads is never going to work with a teen.
You've lumped together a whole lot of problems you have with him, have you spoken to him when you are both calm to, without criticism/showing your disappointment, find out individually why each of these things are happening and what positive steps he and you can do to support him more?
For school, are you expecting too much and he still needs some help being organised? Has the work stepped up a notch, getting too hard and he is struggling, embarrassed, falling behind and doesn't know how to catch up? (try not to tell him he is clever/has academic potential if he isn't feeling it as it is too much pressure). Does he have a routine and a quiet place at home with all equipment he needs where he wont be interrupted for homework/study?
ds(15) still needs fairly regular support/reminders to be organised and motivated for school, we work out/agree an afterschool routine/revision plan together, he also sometimes needs someone to talk through homework with if he doesn't quite get it (I don't get it either, but I am regularly a sounding board if he is struggling and just talking seems to help). I still ask the question, do you have any homework/revision (from afterschool plan) to do when he says he's off to go onto his PS4 and if he has anything ask if he is ok that he'll do it on time/when he will catch up, but let him decide when.
For his personal hygiene, is he feeling low or does he have poor self esteem? Does he have a healthy social life/activities outside school to encourage his physical and mental wellbeing, confidence and wanting to take care of himself?