Sentence:  This school was where my father had been <WSD>dux</WSD> in his senior year in 1937 just as his father had been <WSD>dux</WSD> at the Rockhampton Grammar School27 before the turn of the 19th century. 
Meaning of the word marked with <WSD> tags:  The top academic student in a school, or in a year of school; the top student in a specified academic discipline.