During this time frame (1950->2024)
- higher cost of college
- more people are pushed to go to college
- more jobs require college education
- more pressure on students to pass with high marks
- more high school courses do college prep
- more standardized testing
- more scientific test based education adaptations to make sure kids learn and aren’t left behind
Likely other demographic, family educational backgrounds and other shifts that could alter the grading dynamic as well.
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