Yes.
I completed Year 12 last year and I went alright, but the result was far from my potential. I'm not sure if it's completely my fault, executive dysfunction or a mix of both but I was always lead to believe the first option.. I mean I couldn't really see it any other way.
The thing is, throughout the whole year I'd do these things rather than working at school:
+ Look up reasons as to why I couldn't concentrate
+ Look up reasons how to cope with boredom at school (mostly did this when alone in a quiet room)
Also:
I went to a select entry school, so it was pretty intense. In class everyone was easily able to follow verbal instructions where I was not (especially in chemistry when we had pracs) and I couldn't really think of a reason for it. I just felt really confused and would always finish the prac incredibly slow or not at all, or if it was a group all I'd do was ask what we need and help set it up. In other classes sometimes the teacher would move on too fast, and I'd just give up because I'd be stuck trying to organize my sheet of paper or word document properly (I am some what of a perfectionist). Other times I would just blatantly become distracted or disinterested and not take any information in. In these times, I could have been talking to the person next to me (strictly only if they were 1 of my 4 friends at the school), fiddling with my pencil case, doing online personality tests etc.
I had a few counselor appointments because I kept sending e-mails to teachers complaining why I couldn't seem to study properly like everyone else. At several points I even told some of them that I thought maybe I had something like ADHD. Everyone just seemed to be able to do everything better than I could, even though I was obviously more intelligent than some of them (shown in tests you couldn't study for). I had many blood tests throughout the year because I would be fatigued a lot (and of course the concentration issues). In the original blood test before year 12 even began my iron and vitamin D were both really low, so I took supplements. Throughout year 12 my levels were some-what normalized but some doctors still told me I had low iron, but eventually a more specialized doctor told me that the others were looking at the wrong number and that my levels were actually fine. This left me confused.
Answer to topic - Yes I do have those issues. I can't determine whether or not I'm just extremely unmotivated and lazy (in combination with being a perfectionist to my standards) or if I actually have some executive problems. I'd rather not call it executive problems because that sounds like a cop out, but I've always been this way and I told myself every year that I'd improve, but I never did. Instead of doing things like studying at home I'd be doing personality tests or watching astronomy documentaries, or of course playing games (if I stopped playing games, I'd start work, get pissed off at inconsistencies or from getting distracted and end up researching ADHD etc). Even for my exams, I would basically rote memorize the key terms the night before, and sometimes I lucked out and got an A, other times (harder subjects like chemistry) I wasn't so lucky.