Tests are more easily gamed. It's a tragedy that industries have grown around test prep.
"Nearly half of American high school students – 47% in the class of 2016 – are graduating with grades ranging from A-plus to A-minus. According to the Department of Education, the average high school grade point average was 2.68 in 1990. By 2016, it had risen to 3.38, with the biggest inflation occurring in private independent schools."
https://www.usatoday.com/story/opinion/voices/2021/08/24/cla...
However, I find that I do not know how easy it is to game grades. Perhaps that is equally easy, or significantly easier. For example, can one "game" high school grades by moving to a different neighborhood with a "better" school?