At school, we use Cambridge 3U. It is, by far, THE BEST book for understanding the concepts, and in each exercise, the questions have an increasing curve of difficulty, which I find, is excellent for grasping them.
One thing though that annoys me about it is the way the topics are organised throughout the text. They are sort of, well, all over the place. :S
Another text I find most useful to study from is Fitzy's 3Unit text. Like Cambridge, the concepts are well explained, and the questions are quite good, especially for trig.
Phoenix is good for the questions, but I wouldn't trust their worked solutions. From my experience, I have found too many mistakes, which has in a way, put me off from using it in recent times.
For extra HSC-style questions, I recommend the "100 Mini-HSC" Series from John Smith. It is generally overlooked, and only found in Dymocks (to my understanding), but the variety of questions are by far, the most original. He tends to vary the wording of similar questions throughout the book as well, so you get accustomed to the different ways a HSC paper can ask the same type of problems.
