Let's teach for mastery -- not test scores | Sal Khan

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Sal Khan 追问一次测验之后发生什么。如果课表规定所有人同时进入下一章，即使试卷准确指出知识缺口，学生也只能带着它往前走。掌握式学习把过关条件固定，允许所需时间不同。

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And even though the test identified gaps in our knowledge, I didn't know 25 percent of the material.

What's variable is when and how long a student actually has to work on something, and what's fixed is that they actually master the material.