1 Table of Contents: “...Parental Education, Immigrant Concentration and PISA Outcomes -- Mastery of the Assessment Language...”

2 “...Results from the Survey of Adult Skills (PIAAC) confirm that mastery of the host country's language...”

3 “... reflective citizen". To succeed on the PISA science test, students had to display their mastery of three...”

4 “...Countries vary in the way they use marks, but they all tend to reward the mastery of skills...”

5 “... with, if not mastery of, navigating through digital material where readers determine the structure of what they read...”