How about Canberra High School with Maurice Ongania and Rudi Heuttner both going to WOC in the 1970s and 1980s? Are there other schools with similar records for WOC representatives?
Off the top of my head, the most I can think of is Gisborne Secondary College with 4 (Mace and Jasmine Neve, Kathryn Ewels (Preston) and Troy de Haas). The Canberra group of the 1990s were pretty spread around.
My high school has 2 and 1 reserve (does that count?)
I think Blair's high school can add to its numbers if reserves are allowed.