Seriously, it will help boys, probably white boys, the most. They're not like, grading on a curve to include things like a family's background, but making the grade entirely exam based, to eliminate teacher bias.
It's been well known for a long time, sort of an open secret in K12, that girls get better grades, but boys do better on exams.
There was this push a few years ago, to drop ACT/SATs because they were sexist. The argument was that since girls get better grades in K12, and better grades in college, it must be the tests that were biased since they don't do as well on the tests. By all means, let's make the grading more like the tests . . .
This will help the kids who have access to things like tutors (rich white kids) and boys, the most.