I think I'm starting to understand the purpose of these "experimental questions". And please correct me if I am wrong.
It seems to me that the GMAT is a test that is intentionally designed to be nearly impossible to complete if one attempts to solve all of the problems properly. The purpose being that the GMAT wants to see who is smart enough to recognize questions that are designed to be nearly impossible to answer. The test wants the taker to skip these (they do not count towards the actual score).
I imagine that the test could also keep track of how much time is spent on these experimental questions and could penalize/add points to takers who try to solve rather than skip these questions (the GMAT is also allegedly a test of time management, rewarding/penalizing takers in this regard would support that claim) .
Would I be correct here? I havn't read anything that suggests that this is the case, I'm just thinking out loud.
If so, is there anything that discusses how to identify these questions that the test wants us to skip?
Well, this is (probably) first of its kind hypothesis.
Experiments questions are not introduced for you to skip but are introduced so that GMAC is able to gauge difficultly level and quality of those questions based on correct responses, thus enabling them to later introduce these questions as part of test and retire some old questions.
While it would be great (may be with divine help or super natural powers) to be able to identify such experimental question for your own benefit on test, it is improper to think that GMAC could penalize u for being a mere mortal and be not able to identify those questions
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