I don’t think there is much new here. I think the study does underscore the fact that there are students from lower SES who are not getting the resources that the students from higher SES families do. We need to work on that.
@Dunshire - the “both parents work” factor isn’t really relevant by itself. Comparing a family situation in which both parents work multiple, low paid jobs and have few resources to a family in which both parents are working highly compensated professional jobs is comparing apples to oranges.