Khan thought he could offer teachers crucial new insight into how students learn. He envisioned a dashboard system that would track students’ individual statistics, showing them and their instructors how many videos they’d watched, how many questions they’d answered, and which ones they’d gotten wrong or right. Normally, of course, teachers fly blind. They use quizzes, homework, and their own observations to try to figure out how much their students understand, but it’s a crude process. Day to day, it’s hard to know what a student is and isn’t learning. A dashboard, Khan says, can change all that.

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Cadwell has already gotten so used to these metrics that she feels unmoored in her other classes, where they’re not yet using the system. “In those, I get to a quiz or a test and I’m blindsided when they don’t know something—or when they ace something.”

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But by being able to target her students for special help exactly when they needed it, Cadwell saw stunning results: The class’s test scores improved more than 106 percent in half a year. One girl I met in the classroom had advanced an astonishing 366 percent. “I hated math,” the girl tells me cheerfully. “But now it’s actually fun.” She began the year unable to do basic fractions; during my visit, I watched her plow through complicated long division, carefully working problems on the Khan software.

How Khan Academy Is Changing the Rules of Education. Whether or not the Khan Academy ultimately succeeds, the trend is very real.