With your son’s PSAT and SAT scores, the MCAS should be incredibly easy for him to pass, without studying. You have to realize that this is a very basic competency exam that all MA high schoolers are expected to pass. Perhaps you could ask the local public school to allow him to sit for the MCAS this spring. Surely he could take it next spring if he is enrolled, and he most definitely would pass it. I wouldn’t let the MCAS keep you from enrolling him in high school.