In these early years, Sylvania High was determined to establish itself as an attractive and comprehensive high school. It took until 1975 for the school to become fully populated, with all six year groups present. By 1976 the school population had skyrocketed to over 700 students, with the potential of holding 860.
To increase its profile in the Shire, the school consistently appeared in the Leader newspaper to update the community regarding projects, special events, musicals and sporting achievements. In 1982, the paper reported Sylvania High starting a Driver’s Education Program, becoming one of only two schools in the Shire that offered the course.
Sylvania High began its long association with supporting disabled students from its earliest years, donating money to the Caringbah Lions Club to support a disabled patron in 1982. The school has since installed raised walkways and a lift to allow disabled students to learn in a safe and accessible environment.
In the early days, Sylvania enjoyed considerable sporting success. Of note alumnus Socceroo’s and Sydney FC coach, Graham Arnold was a member of Sylvania High School’s football team that made it to a state final during the 1970s. The school also had success through a girl’s relay team in the CHS swimming carnivals, as well as in rugby league.
The school’s long standing success in the performing arts, began with the 1980s seeing Sylvania High contributing strongly to the now heavily established, Rock Eisteddfod, winning the competition in 1986. This was followed by an invitation to perform at the Schools Spectacular, a tradition that continues today.
The school’s first decade ended in controversy as a consequence of the publication in 1979 of the book Puberty Blues. The book scandalised many, but saw it defended by others. Written by a former student of the school, Kathy Lette, the book explored the adolescent beach culture of Cronulla and was said to be based on the author’s experiences at Sylvania High.
Despite this controversy, a precedent was set in these early years for academic excellence, which would continue through the years. In 1985, the principal, Mr Jim Lowe, experimented with an 11-period day. The results of this were seen in 1988 when the school received a special mention in the Good Weekend magazine for achieving great results in the HSC.