The textbook you'd want to purchase is the CambridgeMATHS NSW Syllabus for the Australian Curriculum. The Essential Mathematics textbook is not relevant to NSW. This textbook is appropriate for the following states/territories:
- Queensland.
- Australian Capital Territory
- Northern Territory
- South Australia
- Tasmania
- Victoria
- Western Australia
A feature of this textbook is that it includes 10A content. Some information about 10A content:
The 10A content descriptions are optional and are intended for students who require additional content to enrich and extend their mathematical study whilst completing the common Year 10 curriculum. It is not anticipated that all students will attempt the 10A content, but doing so would be advantageous for those intending to pursue Mathematical Methods (Course C) or Specialist Mathematics (Course D) in the senior secondary years. A selection of topics from the 10A curriculum can be completed according to the needs and interests of students.
The Australian Curriculum
www.australiancurriculum.edu.au
Ensure that the mathematics textbooks you purchase are all made for the NSW curriculum.
I hope this helps!