* Data Collection Varies: Different countries collect and report this data in different ways, using varying definitions of "high school," "dropout," and the age range included. Some might only track those who leave before a certain grade, while others include those who don't graduate within a certain timeframe.
* Data Reliability: Accurate data collection in some countries, particularly those with less developed education systems, can be challenging.
While precise rankings are unreliable, countries with consistently high dropout rates often include several in sub-Saharan Africa and parts of Latin America. However, without a standardized, globally comparable dataset, naming a single country as having the absolute highest rate is inaccurate.