I've got Advanced Mathematics by Terry Lee and my school uses both the Arnold & Arnold (not Cambridge) textbook and Fitzpatrick. Here's my verdict on them:
*Advanced Mathematics by Terry Lee - A fairly good book with worked solutions for just about every question. It has mostly challenging problems rather than normal HSC level questions. The problem with it is that the solutions often rely on Terry Lee's own methods which may be unfamilar to many and the explanations before each exercise is too brief.
*4 Unit Mathematics by Denise Arnold & Graham Arnold - Great book, the exercises are fairly systematic and the problems are not too hard yet still challenging. The explanations go in great detail and answer each syllabus dot point accordingly and even uses the same number references to the syllabus as well. The problem with it is that the explanations are not too clear unless you understand the work in advanced. It also omits the proof questions in the back of the book.
* New Senior Mathematics 4 Unit Course For Year 12 by J.K Fitzpatrick - A fairly good book with clear detailed explanations that answer the syllabus dot points. The exercises range from challenging problems to simple HSC level questions. The problem with it is that the problems are quite difficult and since there is a large omission of many of these problems in the back of the book, it's easy to get lost in a question.
My personal preference is 4 Unit Mathematics by Denise Arnold & Graham Arnold....