A lot of my subjects require more than just a 'textbook revised' component of information. This is mainly for the humanities, however. For Ancient my teacher designs a mini booklet of sources (those which she finds most useful for each dot point), as does my Modern Teacher. However, for Modern we also use 2 textbooks for the core, and we used particular chapters out of 3 textbooks for our National Study. For Extension History we are using 3 book, and also some booklets designed by my teacher. Legal and Religion my teachers designs handouts of information, and then also use a single textbook. Earth and Environmental Science I use 2 textbooks.
This is all in conjunction with class notes, summaries, BoS resources though. So there's quite a lot there. But I suppose we are getting detailed information that's best for the HSC, which is important. So no complaints from me. =)