According to international human rights law, non-government schools must conform to minimum educational standards, as laid down or approved by the State. Minimum educational standards may relate to issues such as admission, curricula and the recognition of certificates

Percentage of students at the lowest level of science proficiency is the percentage of students at the lowest level of proficiency on the science scale in national or international assessments

Percentage of students at the lowest level of mathematics proficiency is the percentage of students at the lowest level of proficiency on the mathematics scale in national or international assessments

Percentage of students at the lowest level of reading proficiency is the percentage of students at the lowest level of proficiency on the reading scale in national or international assessments

Percentage of schools with potable water is the share of schools at a given level of education with a drinking water facility or water delivery point that is designed to protect water from external contamination, particularly of fecal origin. Examples of potable drinking water facilities include: pipe-borne water, protected wells, boreholes, protected spring water and rainwater

Percentage of schools without electricity is the share of schools with no access to permanent sources of electrical power, for example grid / mains connection, wind, water, solar, permanently fuel-powered generator, etc.

Percentage of schools without toilets is the share of schools at a given level of education without a pit latrine, an improved pit latrine, a flush toilet, a pour-flush toilet or a composting toilet

Mean performance on the mathematics scale is the mean mathematics score for students in national or international assessments

Mean performance on the science scale is the mean science score for students in national or international assessments

Mean performance on the reading scale is the mean reading score for students in national or international assessments