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How a Lincoln High Teacher Gets all his Students to Pass the AP Calculus Exam

Yom, as the students call their Lincoln High calculus teacher, is at the blackboard with marker in hand. He can’t be stopped. Left to right he works, light on his feet, flicking out triangles, stacking towers of numbers, turning Room 754 into a gallery of cave art. And here’s the really impressive part: Every student is locked in. There’s no daydreaming or goofing.