Tell me more about experimental questions.

This is scary! You guys have kept me in dark! Tell me more about experimental questions.
There are around one quarter experimental questions in real GMAT. That means out 37 questions in verbal section 8-9 questions & in quant section out of 41, 9-11 questions are experimental. These questions are randomly placed. Very expert GMAT gurus can guess whether a question was experimental or not, as these questions tend to be somewhat different in nature as well as in difficulty level. They add disturbance to the adaptive-nature of the test. The experimental questions (also known as un-scored items), are not adaptive and the response to these questions are not counted in adaptive test. Thus the question coming next to un-scored item doesn’t depend upon the answer of un-scored item. All this makes GMAT CAT (computer adaptive test) difficult to predict.

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