English Extension is different to English Advanced. You only pick one Module to study for the entire year. You do a several texts (depends on the module though) but the module that you study is the same throughout the year. I for example am also doing Module B: Texts and Ways of Thinking specifically Romanticism and will do so for the entire year.
yep, this is why extension english is quite good. there is a very wide variety of choices from the outset. but you are, as this person just said, only meant to study one topic from one module.
also be prepared, the english extension booklets in the hsc exam are quite long, and you only answer one question from the many topics that are available. so dont waste time looking at other topics, focus on the topic you have done. might also be a good idea to look at last years paper and locate your topic so you know exactly where to go come exam time