SDG 4 is to: “Ensure inclusive and equitable quality education and promote lifelong learning opportunities for all.”
The indicators for this goal are, for example, attendance rates at primary schools, completion rates of primary school education, participation in tertiary education, and so forth. In each case, parity indices are looked at to ensure that disadvantaged students do not miss out (data is collected on “female/male, rural/urban, bottom/top wealth quintile and others such as disability status, indigenous peoples”).
There is also an indicator around the facilities that the school buildings have (access to electricity, the internet, computers, drinking water, toilets etc.)