AdvertisementCuthbertson attributes the unrelenting enrolment demand to the school’s strong HSC results. Castle Hill High School was among the top dozen academically performing comprehensive schools in the state, according to a Herald analysis of HSC average scores, which provides the most granular data on HSC performance among public schools. Castle Hill High School’s head of English, Lindy Jones, has been marking HSC exams for 37 years. AdvertisementKillarney Heights High, Ashfield Boys High and Willoughby Girls High were other high-performing comprehensive schools in HSC English advanced last year. Fully selective schools North Sydney Boys and North Sydney Girls were the top-performing schools for English advanced, while Killarney Heights High was the top-scoring school for English standard.