I took a gamble by not studying all of them in the trials and it paid off so I am really hoping they don't specify a speech.
I have a feeling that the question will be on the Margaret Atwood speech. You should definitely know and have some quotes for all the speeches before the exam, you never...
Use the rubric or past hsc questions as a guide to create practice questions and syllabus points.
For example,
Rubric Statement: "The ramifications of particular discoveries may differ for individuals and their worlds"
Then include a response based on your prescribed text; including quotes...