Sentence:  Imagine a country where children do nothing but play until they start compulsory schooling at age seven. Then, without exception, they attend comprehensives until the age of 16....There are no inspectors, no exams until the age of 18, no school league tables, no private <WSD>tuition</WSD> industry, no school uniforms. [...] 
Meaning of the word marked with <WSD> tags:  The training or instruction provided by a teacher or tutor.