If you’ve wasted countless hours arguing with antisocialists, you know that respecting their enquiries is a waste of time because they can just dismiss everything that contradicts their meme ideology as Judeo‐Bolshevik propaganda. International organizations? Obviously the state must have given them some fake data and the organizations trusted them unquestioningly because secretly they’re all staffed by a bunch of big dumb stupid idiots.

Anyway, I think that these are the exact sources:

https://data.worldbank.org/country/CU

https://data.worldbank.org/indicator/SE.ADT.LITR.ZS?locations=CU-CU

https://data.un.org/en/iso/cu.html

https://www.who.int/data/gho/data/countries/country-details/GHO/cuba

Took me fewer than ten minutes to find them.