Regardless, my point was that if you are challenging yourself and racing the clock, your score is bound to be considerably higher, than if you might just be obediently doing the test to the best of your ability at a comfortable, but accurate pace.
What do they tell the kids when they test them? Do they say to go as fast as possible on the subtests that focus on speed?
My DD is naturally fast, but if you said "Go as fast as you can! You're being timed!" I could see her getting anxious. Maybe that's why so many GT kids score lower on this, too--the anxiety factor?