This will be a long response but I hope you find it somewhat helpful. My oldest was dx'd at 7. I was surprised because we had seen a psychologist when he was three (he was a very intense baby and little boy and had some behavioral issues) who listed ADHD in all of the things she didn't think were issues for him. Of course I had no idea that you can't rule ADHD in or out that young but mentally, I had crossed that off the list.
Anyway...it was first suggested by a psychologist who I lined up for a second opinion on his educational evaluation. He was having trouble in first grade with reading, writing, spelling, and math (which would be everything LOL) so I had the school evaluate him and he came back with his lowest score at the 26th percentile, one percentile above the 25th percentile cut off for services. The psychologist reviewed his report and immediately dismissed it, saying that it was impossible for him to score X in this area but Y in that area, etc. Then he talked with my son, did some other testing, scratched his head a bit and revised his statement to "it's impossible...unless there is an attention problem." He felt that the inconsistencies were indicative of ADHD and in his report to my pediatrician, recommended stimulant medication, to which I said "no thank you."
So...because he wasn't hyperactive and never had behavior problems at school, we were still trying to figure out whether or not he had LDs. He seemed dyslexic and dysgraphic, so I had him tested at another place that specialized in separating ADHD and LDs. That visit was inconclusive, so he had further testing that ruled out dyslexia, so they stuck with ADHD and he had a 504 accommodation plan in 2nd grade. That year, I also hired a tutor who was able to teach him reading, writing, spelling, phonics, addition and subtraction in a very unconventional way that looked like a lot of work to me but made sense to my son.
In 3rd grade, he continued to struggle with school and organization. He never filled out his assignment book, was always missing his homework materials, would do the work but leave it at home, or bring it in but not hand it in...desk was a disaster, backpack stuffed full of papers, couldn't follow basic directions, etc. In 4th grade, his teacher gently suggested that she thought he was dyslexic. I brought her up to speed and she referred him for re-testing. Still not dyslexic, but was considered to have language processing deficits that qualified him for an IEP. So he's had special educational services for 6 years. In the early years, that included OT for handwriting but that ended in 4th or 5th grade so his writing is still illegible. We also saw an "alternative" practitioner who helped a lot with supplements and diet. We did see improvements in his mood, memory and concentration but she was so far away, it was very expensive, and hard to maintain so we didn't keep up with that like I wish we did. It helped with symptoms but was by no means a cure.
Anyway...he's in 9th grade now and this year, asked to try medication. We tried Concerta earlier in the year but he had headaches from it so we switched to Adderall, which seems to be working well for him. Despite saying that it helps him a lot with learning and that he understands things more easily now, his grades have actually gotten worse on it, so it's not a magic cure. This, to me, proves that the LDs were and still are legitimate and separate from he ADHD.
My middle son, age 9, also has some issues but his are less clear cut. He's very smart and is above his grade level in all academic areas - always has been. He is intensely interested in music and will practice all the time without being prompted. His executive function couldn't be better in that he remembers everything, but he puts no effort at all into organizing himself and doesn't care at all about whether or not he does homework or studies. He has a tremendous memory and focus. However...he's super impulsive and literally can't stop himself from talking. He can't concede in an argument, can't let someone else have the last word, and is often physically aggressive towards his brothers and is relentlessly defiant - but can be incredibly, genuninely, heartbreakingly sweet, thoughtful and generous 30 seconds later. He's mercurial for sure. So for him, attention is great but impulse control is zero. Several people have danced around an ADHD diagnosis with him but he doesn't seem to fit that.
I should add in that my husband also has ADHD (ironic because he is not my oldest son's father) so you can imagine the fun I have trying to manage those three. Thankfully our daugther and youngest son seem to be neurotypical because trying to figure out what works and doesn't work for the other three can be exhausting, I can't imagine doing that for one more person.