One way to fix the statistical aspect of that problem is to reduce the possibility for such disparities to exist, which could be accomplished by removing "higher level" classes, such as algebra in middle school. If the upper limit of what a student can learn is lowered, then the students below that limit are "closer" to the students who are are at or above it.
Can anyone convince me this isn't what's happening? It just seems like a entirely ineffectual political move with the singular goal of making the people behind it look good, so that they can retain power. I cannot provide evidence, because part of my theory is that everyone involved in enacting these policies is either lying, or they incorrectly think that these policies help. I just can't see how anyone can think this is a good idea, or that it will help anything other than the stats. But why shouldn't I think this?