The justification for using the SAT-M in underage testing is in fact that: because the material would not have yet been covered in any classes, it tests ability to come up with a correct answer to a novel problem rather than skill. (Remember, educators have long been convinced that any kind of acceleration of gifted kids is poison, and SMPY's results have been a major reason that gifted kids can do any acceleration these days, so they're not just covering it in some accelerated math class.)