@Bendwhat?_over
If you are not familiar with the ES syllabus, then you should download it from the NSW Education website. It's free.
Engineering Studies has four focus areas: Scope of the Engineering Profession, Engineering Communication, History of Technology and Materials Science. In the preliminary course you have to learn about entry requirements to the profession. You should know what is the Institution of Engineers Australia (IEAust), about engineering ethics and why engineers work in multi-disciplinary teams. You learn the basics of engineering communication - report writing and drawing. You have to learn about the broad classification of engineering materials. You need to know some history of technology, what was the industrial revolution etc.