There is a new review report, “School Environment and Leadership: Evidence Review” by Rob Coe et al. The whole four parts are worth the read, but I know you have little time to read them. Bear in mind that the researchers went through 112 studies for their report, but still, if you want to know the answer to the question in the title:

Maybe you are not so surprised. Could be. It would have been strange if you have been following the science of learning and education, and the insights of this report would be a total surprise. Still, it’s a good summary.