Ah okay. I should have done a bit of research:
'The ATAR scaling system is leading to lower scores for some high-level language subjects and has contributed to the decline of HSC languages more often studied by students in low socio-economic schools, new research shows.'
'Languages were assessed separately to other subjects until 2000, and scaled against the two largest languages at the time, French and German.
However, since then languages have been scaled in the same way as most HSC subjects, based on how the course cohort performed across all their other HSC subjects.
The head of the Technical Committee on Scaling (TCOS), which calculates ATARs, Rod Yager, said that the previous system of assessing languages separately was removed because it "disadvantaged any language whose candidature was academically stronger than French and German, and advantaged any language whose candidature was weaker".'
'Dr Cruickshank said that HSC syllabuses and exams for different languages required the same level of proficiency to reach each band, and language students should no longer be penalised for their performance in other subjects.'
Singhal, Pallavi. ‘ATAR Scaling Wiping out HSC Languages, Study Finds’. The Sydney Morning Herald, 22 Apr. 2018.