I wondered this a lot when I was a student in the 2000s. What fraction of kids take the tests seriously? What fraction put in the same effort as they would into

I wondered this a lot when I was a student in the 2000s. What fraction of kids take the tests seriously? What fraction put in the same effort as they would into their academic tests? I had some friends who were poor students and didn't care much about school. I doubt these people put in much or any effort at all into these tests. I was a good student, but at a certain point I got burnt out too. It wasn't worth reading the 10th literature passage extra carefully, nor checking my work on each math problem. These tests are long and don't impact me: why should I give it my all?