Why Are Gen Z’s Test Scores Falling?

The world’s largest international study of 15-year-olds has revealed a worrying decline in performance in science, mathematics and reading, raising questions about why teenagers are struggling across core subjects.

The findings span skills central to education: understanding written information, working with numbers and applying scientific knowledge. A decline across all three areas raises broader concerns than a setback in a single subject.

The summary of the study does not identify the causes of the fall or specify how large the declines were. It also gives no country-level breakdown, leaving unclear whether the trend was widespread or concentrated in particular education systems.

Although the results invite questions about Gen Z’s educational performance, the study concerns students aged 15, not an entire generation. Understanding what lies behind the decline will require closer examination of the findings and the conditions in which those students have been learning.