* Definition of "school": The definition varies widely. Does it include preschools, primary schools, secondary schools, universities, vocational schools, etc.?
* Data Accessibility: Many countries, particularly developing nations, lack comprehensive and reliable education statistics.
* Constant Change: The number of schools is constantly fluctuating due to new school openings and closures.
While various organizations attempt to track this data, the numbers are always estimates and vary widely depending on the methodology and definition used. Therefore, providing a specific number would be misleading.