Do not assume that all countries use the same systems of education. Primary, secondary, tertiary, high school and college may have different age or grade levels associated with them in different countries. Describe school-aged sources with age and contextual equivalents.
It is inaccurate to define all education systems using standards from a single region or country.
Do not use the word ethnic to reference or categorize people in any circumstance.
Instead, choose a context-rich description that clearly and accurately defines the shared characteristic relevant to the story, whether religion, cultural practice, language, race or other trait. Allow sources to self-identify. The term is acceptable in a quote.
The words ethnic and ethnicity, and phrases related to them, are imprecise and often misused. Related phrases, such as ethnic tensions, are often used to generalize complex circumstances including conflict, genocide and racial issues. Readers are not served when a story fails to precisely illuminate those complexities.
This is a deviation from AP Style.
Use E.U. as an abbreviation for European Union, with periods, in headlines and on second reference.
Consistent references to global entities ensure reader clarity.