I'm another 'suspected ADHD Inattentive' struggling to get my shit together, but making a serious attempt to right now. Up until now i've been blessed with a brilliant memory so could replay my movements and track down shoes, keys etc (thanks a lot peri-menopause for ruining that...). I have way too many tops, so that finding one is easier. Finding a matching jacket/cardi is harder, so i'm trying to rejigg my wardrobe so that it is naturally more coordinating.
I am terrible for procrastinating, but know that i am better at getting things done in the day if i have to be out somewhere in the morning.
For DS1, when teaching him to timekeep in the mornings, i put a digital clock in his room and made a list of everything he had to have done and by what time. It included every phase of the getting dressed process, pants, trousers, shirts, socks, tie etc. All broken down to 5 or 10 minute intervals. A copy if this list was on the wall in each room he would need to go into.
Latest school drop off time is considered by us all to be door opening time - which actually gives us 5 extra minutes. We live a 10 minute drive away.
If we have a day of getting there 'late' (ie not BEFORE door opening time) we discuss what happened that morning to make us late, identify the cause, and work out what we need to do to avoid it next time. This is absolutely essential. I'm trying to rigorously teach my DSs to be able to timekeep. Heavy rain will automatically make the journey longer as there is more traffic on the road, so we add 5 minutes to the journey. Same with frost, as i need 5 minutes to defrost the car.
I have spare lunch boxes, DS2 has 10 school jumpers ( i'm NOT joking) because he keeps forgetting to bring them home. So on a Friday i attempt to get him to bring all of them home - only moderately works for jumpers - end of half term/ full term locker clear out will see 6 or so jumpers come home. Thank heavens for second hand uniform sales....
My best friend is as bad naturally with timekeeping as i am, so we either meet at each others house, i take a book with me when meeting out, or arrange to meet near where we're going and we'll text each other as we're on our way. Whoever is first will mooch around a nearby shop and the other one will find them. If either of us is timelimited on that day we make a point of telling the other one, and put the effort into being strictly on time.
But i'm lucky that i've developed routines and coping mechanisms that get me through (usually false earlier deadlines), and to most places on time, or rarely (now) 5 or 10 minutes late at the most. If i leave it to my natural organisation i know i would be a half to a full hour late.
A really good book is Driven to Distraction - reading it for my DSs made me realise that i have it too. I've asked for a referral but it will take 12-18 months.