It is not harder because the kids are younger, it is a harder class. At least a few years ago, when my junior took it. I talked to the teacher because my kid was struggling and he told me that they had designed the class for the really super advanced kids and that he thought they were admitting too easily (FWIW, my kid got like a 96 or 97 on the IOWA, had never gotten under a 4 in advanced math, always pass advanced for SOL and he was not prepared). I also realized that a lot of the kids had taken algebra over the summer. In any case, I don't think the legendary teacher is at Longfellow anymore so it may have all changed.