ACT and SAT each have their own parts of the country. The GRE has its lock on graduate admissions. And so one could blame the companies but really economically they have no incentive to change things very much because they’re getting the business.
So for example if a child is labeled as having a learning disability it has very concrete consequences for the kinds of services and potentially accommodations that child will get.
To the Kenyan families school doesn’t really matter because none of them are going on to college. Almost all of drop out of school and so they’re spending their time learning things that are important to them.
In other words if a teacher only teaches in one way then they conclude that the kids who can’t learn well that way don’t have the ability when in fact it may be that the way the teacher’s teaching is not a particularly good match to the way those kids learn.
There is no recipe to be a great teacher that’s what is unique about them.