>If it's environmental, then shouldn't going to university substantially increase these students' IQs? Or university could just be very bad at increasing intel

>If it's environmental, then shouldn't going to university substantially increase these students' IQs? Or university could just be very bad at increasing intelligence. The goal of university isn't to increase intelligence, it's to increase knowledge, that's why university exams test students' knowledge. Outside of a few subjects university generally doesn't explicitly teach critical thinking or logic/problem solving, the skills most relevant to IQ tests.