DD was still entirely capable of 'throwing' a test of enormous import as late as 12 or 13 years of age, which is why we were REALLY holding our breath over her PSAT. That was the first 'real' test like that-- timed, externally scheduled, and of do-or-die importance to the larger world.
We didn't bother with a formal eval of her when she was young due in
very large part due to this tendency-- she was volatile and capricious in terms of her innate cooperation with ANY evaluation or assessment until she was about 13. Even the CAT-5 that
we administered to her at 6yo, she hit ceilings on everything, but you could tell when she hit a wall because she
started just randomly guessing on the last-- social studies-- section. She still scored ~96th percentile, but it was notably below the other sections.
And she was
smoooooooooooth-- nearly good enough to fool even ME on occasion, and certainly good enough to fool anyone else, particularly if they didn't know her well.
She threw exams in school on a pretty regular basis, in fact. Until I got wise to it (cyberschool) and would simply (wordlessly) hand something back to her and say, "Well, I think you're going to be reworking THAT. You have an hour."
She only learned by me promoting the idea that there was a sort-of-immediate COST to those actions, see-- because the
payoff for being flakey is certainly immediate.
