You should know some for your case study country and Australia. I wouldn't worry about it tho because you'll just memorise them while studying the topics anyway, plus knowing the trend of a statistic is a lot more important than the actual numbers. e.g you can say that the NPY deficit usually contributes to around 3% of the CAD due to high FD from persistent CADs but the BOGS tends to fluctuate depending on world economic activity and it can be a deficit or surplus. I think you could show more knowledge by talking about contemporary issues e.g covid and its effects on economies rather than old statistics because it shows the marker that you actually have an idea/care about economics.