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9#
发表于 2011-7-13 16:49
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letsdothis Wrote:
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But you don't know which 15-30% of the material will be tested. Sure, there is some score variance, but if you know 50% of the material and the 15-30% that is selected is random, then your expected score is still 50% (I guess plus 1/3 of the remaining questions, given that they are multiple choice). |
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