After 8 years of devoted service, Iles resigned in 1972 and was succeeded by Mr Rex King. In addition to improving the school facilities, he also attended to pupils' application, which resulted in marked progress in academic work. His efforts in promoting Putonghua was pioneering. During his headship, the number of classes rose to 31 while the number of students reached around 1200. When King resigned in 1978, Mr Mui Ho-bun replaced him as headmaster. 12 years later, Mui retired in 1990. An old boy and former member of the Legislative Council, Mr. Yeung Po-kwan, took over the reins.