How A CAT "Adapts" To Your Performance, continued

The Exam has a vast database of questions from which to draw. Each of these can be categorized according to expected difficulty level and content type (e.g., geometry, ratios). Therefore, the Exam can pick questions necessary to fulfill requirements for a designated range of material to be tested, and it can use the difficulty level of questions to determine your score.

There is one exception to the above process: experimental questions. These are questions used by test makers to collect data for future tests. These questions do not contribute to your score, and there is no way to identify them. Treat each question as if it were scored.