I don't understand why you need to explain the first... It sounds so ridiculously minor that I've never seen an app that would require it. I'd send the LSAT addendum but I wouldn't send the other.
Oh, and don't mention that the professor who wrote you to the dean was a first year professor in your addendum though! While that provides context to us, I don't think admissions would like it. Just and FYI.
... require you to submit an addendum explaining what happened and how ... score, write an honest/ forthcoming addendum and watch the acceptances roll ...
It will hurt but you have to move on. You have to show them that it is PAST. Try to end your addendum with a positive note such as "After xxx, I finished school with a 4.0/4.0 GPA" or "I finished my last two semesters in college with straight A's."
I have ADHD and another neurological disorder that ... for accommodations. (standard accommodations for ADHD are time and a half ... accommodations I was granted for ADHD).
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I also think that ADD/ADHD probably have something to do ... to power through. I am ADHD af (plus I have another ... who don't have ADD/ADHD or other learning disabilities. It ... best for you. Sometimes, ADD/ADHD just aint having a 2 ...
Another way to go is just never cancel and then write an addendum and all will be forgiven. I'm way too curious a person to ever cancel or take an undisclosed test.