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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. 70-662 / 70-685 / 70-511 / 70-573 / 70-667 / 70-686 / 70-448 / 70-513 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.