Economic status and two-parent vs one-parent households are both stronger indicators of educational achievement than pretty much any other, including race.
However, when broken down by race, economic status is heavily weighted by race in America and Canada (differently in each country, but but still present).
One can’t simply assume spherical cows here, because there is a deeply historic, systemic, and persistent imbalance which gets compounded through chronic underfunding of economically depressed (and mostly minority) education systems. Some of the systemic racism is ongoing and being actively encouraged by bad actors who misuse the words of Dr King to oppose real measures that would begin to address these imbalances.
Economic status and two-parent vs one-parent households are both stronger indicators of educational achievement than pretty much any other, including race.