Doc Brown's chemistry clinic for online chemistry revision. Although this site centres around UK science courses, the study notes and revision quizzes should prove useful for chemistry revision of any science course taken by 11-18 year old school students. This page in particular has advanced level chemistry revision notes and exercises (suitable for Year 11-12 students).
This site is the gateway to what is happening in chemistry in Australia. RAC is both the qualifying body in Australia for professional chemists and a learned society promoting the science and practice of chemistry in all its branches.