(1) choose a better school district, i.e. buy or rent housing in a more expensive location -- not applicable to poor parents
(2) read with their young kids; help older kids with homework -- requires time and a good enough living situation and enough education of the parents. Encouraging reading to kids is one of the top parent-education strategies being tried. The amount of help a parent can provide is limited by their own education level and time availability.
(3) Provide a stable environment where kids have good food, space to work quietly and access to books and computers -- this can be hard to impossible for the poor!
(4) transport kids to school every day -- most families in the US are expected to transport kids to neighborhood schools. For the poor, this means walking regardless of weather. In bad weather, attendence of the poor is way down, understandably.
(5) extracurriculars -- other than in-school sports, these typically require fees, parents to drive kids places, and parental time. Not possible for many poor families.