It can not be directly tested in year 12, but here's some stuff off the top of my head I encountered again in year 12:
- behavioural, structural, physiological adaptations of endotherms and ectotherms (anything you memorised in y11 you should keep)
- all the microbiology content you learned in y11 (cell cycle, cell structures, the basic processes that occur in cells, types of microorganisms and what delineates them from each other)
- the stuff you learned over about biological diversity will transfer over as you will explore how biological diversity occurs through genetic flow and drift, and different types of genetic inheritance
- Theory of Evolution and selection pressures
You'll take all this knowledge and add a new layer to it.