DS's teacher just implemented this in the classroom last week as her solution for differentiation. I'm unfamiliar with the program but see it's made by the Accelerated Reader people. I'm not a fan of AR and certainly not as a differentiation tool.

Does anyone have a kid using it that can explain how it works to me? The teacher explained that they use a scanner to put in their scan-tron answers but didn't really know how it would let the kids actually work at their individual level.