If you are looking for the best resources to prepare for the HAST test, I would recommend you to check out Selectivetrial’s question banks. Their papers are set by academic experts and they will give you the real exam vibes. You get familiar with the question format as well as the type of questions being asked. I gave my examination last to last year. The HAST exam is quite competitive and you need to have solid preparations to ace the test. There are four sections that you need to answer- mathematical reasoning, abstract reasoning, reading comprehension, and writing task. Each section has a set of questions that you need to answer within a certain time. As such, there is no particular book that you can refer to for studying and the reason is quite obvious. Questions are based on problem-solving and logical reasoning and it is mostly out of the curriculum that you study at school. So, you need to practice a lot of trial test papers. The mantra is to attempt as many questions as you can. Maybe you’ll get some of them wrong but you always have the option to check the answer. The aim is to practice as much as possible until you secure a 95% in the trial exams.
Hope I’ve been able to answer most of your questions. However, if you need more guidance on how to solve each of the sections, I would recommend you to check out this blog selectivetrial.com.au/hast-test-tips-and-tricks/.