Heres the 2 essay formats:
Essay 1: 5 minutes reading / 25 minutes writing- It's a science prac, but for this year, you only need to write a discussion by answering the questions. Be sure to draw the diagram, although it doesn't tell you to do that. You also need to know dependent, independent and control variables as one of the questions will ask you to mention them (I got mixed up between dependent and independent).
Essay 2: 5 minutes reading / 25 minutes writing- You're given some info to write in your essay. Try including them as many given info as possible. I think you can apply your knowledge to your essay because I did that. Usually, the topic is based on biology. For example, this year we wrote about Port Phillip Bay's water quality (I don't think I did well on it. I forgot to email JMSS for my report, so I don't know). There were facts about Port Phillip Bay, water qualities of some Victorian beaches, how Port Phillip Bay's water contamination affects other rivers / lakes / beaches etc., pollutions in Port Phillip Bay, etc...
EDIT: all the information on each test can be found one page 1 of this forum, courtesy of mi-xao