That's all good! What's your 3rd text?
The probability of them asking for three prescribed texts has been debated for quite a while now. For several years it's been 2 prescribed texts and 1 related text, but this year could be the year it changes, so definitely have some stuff on your third text up your sleeve.
Literary worlds is harder than WOU, especially because it's so broad. It's essentially an umbrella term for all the other modules like WOU, Literary Homelands, Reimagined Worlds etc, but what it focuses on specifically is the way that writers create literary worlds and the reader's relationship with literature. Oftentimes, they'll ask for either a 25 mark critical, 25 mark creative/discursive OR a hybrid eg. 10 mark critical, 15 mark creative. The best way to prepare for literary worlds is to have a good understanding of how things like context, genre and language are amalgamated to create a convincing literary world (one that displays verisimilitude).
I have specific resources from when I did EX1 that I can put up on BOS but I'll need to find them first. For now, these might be of use (the ETA website also has some good stuff, my teacher used that site a lot):
An index of pages containing curriculum KLA resource catalogues
www.hschub.nsw.edu.au