First off, ADD and ADHD are both very real disorders. There is a lot of variability among people who have either of these disabilities, which inevitably causes a great deal of confusion about what it means to have ADD/ADHD. It is difficult for many people who do not struggle with ADD/ADHD to understand. Yes, it is true that we all get distracted and disinterested from time to time. Just becuase you lack motivation or are distractable does not mean that you have ADD.
As someone who has been through the extensive diagnostic testing (and who has been diagnosed with ADD many years ago), one of the primary determining factors is a large discrepancy between one's intelligence and processing speed. For instance, even though my intelligence score fell in the 97th percentile, my processing speed was in the range of people with mental ******ation. I am an extreme example of someone with ADD- predominantly inattentive. The idea of extended time is to level the playing field. (Like the prescription glasses example.) There are a plethora of additional psychoeducational tests (which I am no expert on) which help determine who falls into the criteria off ADD/ADHD.
My story:
I have been receiving extended time testing since I was diagnosed in the 4th grade. I was first put on meds at this point too. I was on Ritalin for that year, but stopped treatment becuase my teachers said I looked drugged and we did not see any improvement. I was a C, D student at this point. (Since this time I've learned that the dose was way too high.) With the rigorous help of my parents, I learned strategies on how to manage my ADD, no meds.
In middle school I felt that I was being held back becuase of this disability. I wanted to take honors courses in high school, but was not on that academic track. I made a deal with my headmaster that if I took summer courses and got A's then I could enter the honors track. And I did. I continued to receive extended time testing throughout high school, took honors and AP's, and graduated Cum Laude.
Many people do not start experiencing ADD symptoms until later in life, like in college which is why you see postings about people who did quite well in HS but struggled in college. Also, there is the parental factor. In HS we live at home and have to answer to mom and dad about "Did you study for your test?" For people with undiagnosed ADD, it often first surfaces in college when there is less structure and more responsibility. It was the structure of the home environment which kept them afloat, so to speak.
So here I am, a Phi Beta Kappa graduate from college and applying to dental school. I was re-evaluated just a few months ago so that I could receive extended time on the DAT. I too am worried about the Adcom's biases, but I know that it would hinder me more to try to complete the exam under the time constraint. (I'd get only about half way through each section.)
As for my personal statement... I have debated long and hard about this issue. I am leaning toward not mentioning it. I think that it has a greater potential to harm than help. Some people here have good reasons to mention it, like the guy who dropped out 2X. In this case I think it is good to discuss. But in my case, I have it under control and have been able to succeed. So to mention it would only hinder my application.
Okay, I know this is long, but I feel it addresses many issues brought up thus far on this sensitive issue. I hope it has been helpful. 🙄