The State Library of Queensland provides material that will help students from upper primary to undergraduate level.

yourtutor 

yourtutor is a free, live, online homework help service for grades 4 to 12. The service is available Monday to Friday, 4-8pm - for instant, one-on-one assistance with maths, English, science, research and study skills from friendly, helpful tutors. The service is available to all Queensland public library members. Online Support is available if you are having trouble using yourtutor.