I am currently studying with my them. In the first half of my second year, doing it part time.
The best bit of advice I have found is to write out each assignment and have note pages to hand while you study so you can take notes relevant to the assignment as you go. Do NOT forget to jot down which bit it relates too as well so you can find it easily later for references! So many times I have extensive notes about a small article or video that I desperately want to use as evidence but can't remember which week or section it was in and have to go trawling through all the week to find it again to reference it.
Definitely keep all your books/notes/pens together in a folder so it's easy to get started. In my first year I had a couple of lazy days where I didn't do uni work because my book was somewhere in the kitchen and my notes were upstairs and I couldn't find a pen....
Do the work first thing, if you start putting it off, saying "I'll do it after lunch" "I'll do it after tea" "I'll do it after this next episode" you will never get around to it. Because you're solely responsible for organising and motivating yourself it's really easy to put things off.
Definitely get any diagnosis or medical help because that will open up an even bigger wealth of support and understanding. The open uni is good for support in most situations but absolutely brilliant with any kids of disabilities.
Make a very visible note of deadlines, alarms on your phone or a written calendar/sign on the wall etc.. nothing worse than having the wrong date in your mind for a cut off and realising you only have a day or two to turn something in that you haven't even started!
The most important one.. have confidence in your ability! Go for it, and always submit something even if you think it's rubbish. Not submitting anything will always get you less marks! You can do this ❤️