Agree with MrsMcMoo please stop shouting, and I am really talking to myself too as I shout too often!
I do feel, for me when I start shouting that I've lost the kind of moral ground/authority in the situation and it has turned into a bit of a verbal rugby scrum.
It may be that you can find a parenting course for teens or pre teens or whatever that can support you.
In terms of the list of things to do, my dd found making her own list with photos of he stages to get ready was helpful, your son may be a bit old for this so I would really suggest you gently nudge he way he gets himself ready and how he remembers back to him.
I would suggest you read How to talk so children will listen and listen so children will talk this book is really helpful.
I am a great believer in the power of positive images and positive thinking. One of the things the book encourages is the idea that you can encourage children to participate in problem solving. So you could ask your son how best for him to get himself ready for school and act as if you really think he can come up with some ideas.
Try not to talk too soon, silence can be a bit deafening and we sometimes rush in to speak. But wait and listen, the books suggests some tactics for engaging in conversation, it is really good.
So for example there might be a written list, or a picture list, or a symbol list whichever he chooses. Trial it for a few weeks. Maybe get into the whole 'are you on 'step 4' now rather than 'have you got that jumper on yet! Or whatever.
I also think think look into the bullying thing. It is odd his things have disappeared and not turned up in the lost property. Asking him direct questions may not provide the opportunity for him to talk, you need to create space where he feels safe to talk.
I do hope all is OK. Is he managing the work of school OK?
Are there any other issues for you, OP?
Good luck 