Portugal has a relatively high illiteracy rate - 4.6% of residents over the age of 15 cannot read and write.

An excerpt from the article 37 facts about Portugal

Compulsory education lasts nine years, i.e. from the age of 6 to 15. Primary school is compulsory, universal, free, and uniform. It lasts nine years. Various teaching and organizational solutions are used in education, such as television education at the primary school level and parallel education, i.e. the possibility of learning in a day, evening, or television school at the secondary school level.