You mentioned pretest, or unscored, questions. Why does the testing service include them on the exam, and what do they mean for the test-taker?
The testing service is continually replacing questions in its data base with new ones, if for no other reason to prevent test-prep companies from hiring sharp test-takers with keen memories to take the GMAT againin order to replicate the official test bank. Before a new question is added to the bank of scored questions, it is included in the bank of unscored questions, so that the testing service can determine its difficulty level and its integrity (both as determined by test-takers responses to the question). Pretest questions will look just like scored questions, and you wont be able to distinguish one type from the other. So theres no sense in trying to guess which ones are unscored, and make a quick random guess on them to afford you more time on the scored questions.
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