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From the perspective of a test developer, there is great variability with respect to time and effort needed to prepare a test. 70-622 / 70-632 / 70-638 / 70-665 / mb7-839 / mb7-840 / 70-178 / 70-521 Likewise, from the perspective of a test taker, there is also great variability with respect to the time and needed to obtain a desired grade or score on any given test.