My father's school books

As I cleared my father's table at work, I came across his old exercise books from high school. I think it dates back to 1951. His education was interrupted by the Japanese invasion in 1937 and subsequently 1941. In 1951, it was difficult to go back to school in the postwar rebuilding period and he did not remain in school for long. I can see his neat handwriting, with words in English and characters in Chinese. These look rather unlike his writing in his later years.