He issued a Compulsory Education Act that required all children between the ages of four to eight years old (grade1-grade 4) to attend school. English was a compulsory subject to be studied after grade 4. In this period, English received the highest priority, as can be seen from the time allocated for English language teaching, in the secondary school curriculum. As many as seven and a half hours were allocated to English language teaching compared with five hours for Thai and arithmetic. Although there was a change in the curriculum between 1921 and 1928, English was still a compulsory subject.