There is another post on this same community that refutes this exact study and others like it (or purports to refute it, anyway).
Just based on my own experience 20 years ago vs my kids’ now, I feel like high school grades are now way more about organization and following specific, arbitrary instructions, which are very home-life influenced, than any kind of skill or knowledge assessment. Maybe they always were? I think those things correlate in kids with reasonably secure lives, but they are different things and may not always go together. Curiosity, rabbit-holing, tinkering, and rigorous analysis/criticism are all very distinct from learning what your teachers want each day and finishing the assignments. Which ones are more important for a given class may say more about the class than the student.
There is another post on this same community that refutes this exact study and others like it (or purports to refute it, anyway).
Just based on my own experience 20 years ago vs my kids’ now, I feel like high school grades are now way more about organization and following specific, arbitrary instructions, which are very home-life influenced, than any kind of skill or knowledge assessment. Maybe they always were? I think those things correlate in kids with reasonably secure lives, but they are different things and may not always go together. Curiosity, rabbit-holing, tinkering, and rigorous analysis/criticism are all very distinct from learning what your teachers want each day and finishing the assignments. Which ones are more important for a given class may say more about the class than the student.