NSW HSC online an extensive online learning tool with study resources such as comprehensive subject information and test papers for 51 subjects.
The Universities Admission Centre processes applications for undergraduate degree, diploma, and postgraduate courses. Applications open early August of each year and close late September of each year. Also includes information about the ATAR.
The Board of Studies NSW Australia serves teachers and a million students in both government and non-government schools. Useful links:
HSC Syllabus http://www.boardofstudies.nsw.edu.au/syllabus_hsc/
Online Multiple Choice http://www4.boardofstudies.nsw.edu.au/
HSC Past Exam Papers http://www.boardofstudies.nsw.edu.au/hsc_exams/
Bored of Studies designed by and created for students.