What would be the best combination of subjects for goi go to psychology/psychiatry?
The above is correct in terms of meeting the requirements of your chosen degree as your ATAR is the essential component that universities will consider when assessing your application.
However, in terms of subject knowledge that may be beneficial with respect to studying psychology at university, Society and Culture (which I believe you are already taking?) would be a good option for you if you wish to study a Bachelor of Psychology (or another degree involving psychology) at university. Society and Culture allows you to develop your knowledge of the interaction of people, societies, cultures and environments. It also explores other aspects of societies and cultures, such as power, authority, gender, technologies and globalisation.
Society and Culture also covers cross-disciplinary concepts and social research methods from fields such as anthropology, communication, philosophy, social psychology and sociology. These are fields that you are likely to cover within a Bachelor of Psychology.