The only difference in PMAP and MAP is the headphones. There is no ceiling. I think the difference you see in the scores tends to be the gifted kids tend to like reading to themselves and working at their own pace better. For non gifties there tends to be a drop in their scores when they switch.. the opposite for gifties. IN PMAP the questions do get harder, just as MAP, when the questions are answered correctly. The more correct the more test questions there will be.