fort street high school teaches all six grades of a standard secondary education in new south wales, from year 7 to 12. it operates under the new south wales department of education and training (det) and is registered and accredited with the new south wales board of studies, and therefore following the mandated curriculum for all years. administratively, the six grades are divided into three "stages" of two years each: stage 4 (years 7 and 8), stage 5 (years 9 and 10) and stage 6 (years 11 and 12).