the parents of private schoolers are usually rich and have money for diagnoses and assessments. sometimes the private schools will also push the students to apply for disability provisions to get an advantage i suppose, like i really doubt 1 in 3 Reddam house students really need rest breaks, but 1 in 3 get disability provisions. also public schools tend to have less resources for submitting and dealing with disability provisions, for example i go to one of the better funded public schools, but the school still turned in my disability provision application late
In recent years (POST COVID), NESA has actually been more strict on granting provisions of 'greater significance', that being: extra time to write, individual room, keyboard access, etc. This is partially due to excessive (& less genuine) applications by 'wealthier' parents and schools. This clamping down has actually been an issue for students with more genuine needs who do not have the money and/or time to bombard NESA with a plethora of psychiatric reports.
The shortage of available psychiatrists (in all of Australia) certainly doesn't help.*
However, the 1 in 3 students having provisions was mostly a phenomenon during 2020-2021, before NESA clamped down on them (as stated above). And even that was for all types of provisions (not just rest breaks), which can include anything from writers and readers, to diabetic provisions, and the 1 in 3 number was mostly a one-off from Moriah specifically. Those figures have partially reduced as of 2022, and you can view the individual application stats (categorised by respective schooling sectors) on the NSW Gov website*, where you can see that in 2022, private schools saw a percentage of fully declined applications much higher than that of government schools.
Even still, rest breaks aren't that significant of a grant considering NESA's historical (and ongoing) leniency in offering them under any of the following conditions:
(Anxiety disorder, Fatigue, Pain, Concentration difficulties (e.g. ADHD))
ADHD and Anxiety especially are on the rise in school-year children*, and having any of these - even with minimal psychiatric documentation - are essentially a guaranteed basis for obtaining rest breaks in the HSC.
I do agree that NESA's whole system is pretty flawed to begin with - especially with favouring private schools -, but UAC mostly makes up for this with their adjustment factors under EAS*, which accounts for long-term disadvantages to one's schooling (e.g. disability, low socio-economic status, financial hardship, personal events, etc.).
* links (remove space after "www."), idk why it doesn't let me hyperlink them:
www. abs.gov.au/statistics/health/health-services/patient-experiences/latest-release
www. nsw.gov.au/education-and-training/nesa/hsc/facts-and-figures/previous-years-disability-provisions
www. aihw.gov.au/reports/children-youth/australias-children/contents/health/children-mental-illness
www. uac.edu.au/future-applicants/scholarships-and-schemes/educational-access-schemes
lets all work hard and root for each other to do well regardless of circumstance or opinion 
