The Hazard Perception Test (HPT) is a practical, computer-based test. To get an idea of what the test will look like and how you will interact with the touch screen you should not just rely on the 3 online simulations provided by the Department of Transport. Although these examples feature real traffic clips and instructions like the real test, they do not provide enough variety to effectively prepare you for the HPT.
Luckily, the Driving Test WA has a handy resource that simulates the HPT very accurately. These practice tests consist of clips of real traffic situations and require a quick response, just like the real HPT. There are 6 practice tests, each with 7 or 9 questions for a total of 44 questions.
This is the number one (and essentially only) resource to practically prepare for the HPT. You can find links to the practice tests and Driving Test WA commentary on the appropriate responses here.
Check out the other resources available to help you pass the Hazard Perception Test and get your provisional licence (Red Ps):
Learner Permit Resources
Red Ps Resources
Green Ps Details
Full Licence Details