Some good (well organised) content notes, videos, practise problems and worksheets.
Great video explanations of content, structured to the syllabus IQ's.
Paid site from Macquarie University ($99/year).
A mix of video lessons, simulations, games and problems.
Online video content (similar to Edrolo)
Sydney University HSC resources (content notes and problems)
American college textbook as an extra source of content/problems. Covers most of our content in more detail than our syllabus.
Online resources
Content notes and problems.