Seems like almost a truism to have a creative big picture thinker who rushes through and makes mistakes with details. I wouldn't necessarily count on it changing dramatically as a develomental thing. "I'm sorry Albert, this whole E and M and C thing is meaningless, because once again you've forgotten to tie your shoes."
There can be many different reasons behind rushing like trying to get any meaning out of the activity to make it at least somewhat intellectually challenging. Or to avoid the highly-attentive anxiety laden perfectionist inner voice waiting for you to obsess even a tiny bit about completeness or accuracy. Completing 90% of the questions in 5 minutes is better than staring and obsessing over the first question for 30 minutes. And then there can be an added challenge when vision problems make it easy to miss details.
That's all from personal experience (duh, not the Albert part.) But maybe it is developmental
