If you're even barely competent the hazards test is easy.
Personally I found it insanely hard due to:
The Lack of feedback
The incompetence of a computer monitor to accurately show your surroundings (I don't know how it is im Malbourne but here I had a CRT and the video quality was crappy, pixellated everything,)
The car having a set speed that is shown to you, so when it says 60km/ph, it's not like you know just how fast it will be moving.
Either way this could have just been me.
parallel parking is quite lenient, there is only one car and as shinny has said you have 7 metres and I think 5 changes of gear. You are supposed to be 30cm from the kerb and stop the car turn it off and tell them that you are done but when i did mine she just opened the door and told me to head off without even having turned the engine off.
I was really lucky as I took the same route that the instructor took me on and also had to park behind the exact same car as with my instructor.
Remember your headchecks.
Good luck