Many parents and students view HSC education as a self-fulfilling requirement simply because everyone who leaves school must also be trained to follow their peers. You can take online basic chemistry classes via https://twig.sg/class-schedule/
HSC is a competitive activity and students compete with each other for a limited number of coveted university internships. From this point of view, we can understand why HSC training can be a self-fulfilling requirement.
However, one of the often-overlooked reasons for the prevalence of HSC tutoring, especially in NSW, is the fact that it addresses shortcomings of the public schooling system.
Firstly, many students find tutoring helpful because many want to invest more than the standard 6 hours a day into their schooling, especially during the lead-up years to the HSC.
Secondly, many students find that they are receiving inadequate help from their school teachers. As controversial as this may sound, in our experience as teachers, public schools from disadvantaged areas may have teachers that are of a lower caliber in general, and students suffer as a result of this. By 'lower caliber', we mean a combination of decreased motivation and dedication, and also a lower standard of knowledge.
Case study 1
One of our students went to a mediocre public school located in a disadvantaged area. From his description of the atmosphere there, it was obvious that the other students there were not interested in learning.
When the Physics trial exam came, naturally our student topped his class (it's not hard when the class is full of trouble makers), but what was surprising was he topped his class by a huge margin. His score was 100%, and second place was 77%. When teachers asked what his secret was, he answered "Physics tutoring".