When our school’s college guidance counselor asked for a brag sheet I mentioned that some of my younger son’s lower grades might be explained by the fact that he chose to drop a 504 plan that he’d had in middle school so he no longer had access to a keyboard or extended time on tests. I don’t know if she mentioned it or not. If there was a brief grade drop resulting from an illness or special family circumstance, I might mention it in a line or two in the “is there anything else we should know about” section, but not as part of any essay, but even in that case, it might be better for the GC to address it.