This study is a surprise in the Child Development area, because it's against every evidence we see today. It also tests for the wrong "symptoms" like depressio

This study is a surprise in the Child Development area, because it's against every evidence we see today. It also tests for the wrong "symptoms" like depression, since the actual major factor here is the how their brain developed in terms of moral, sociality, POV's and a lot more. They're checking grades but grades don't say anything about how they studied for the test. Did they have to sacrifice because of bad behavior to the test (not studying in time, losing friends activities, etc)? Did they cheat? Or were they lucky? Grades don't say any meaningful thing about the brain, it's a wrong "symptom" to check for grades. Edit: typo