At the end of the day, the question you should ask yourself is "Is this a good combination of subjects for you?", "Are you capable of doing well in these subjects" and more importantly, "Are you passionate about these subjects and are willing to work hard to excel in all of them?". Don't doubt your choices, just focus on how you can take advantage of your choice. There is always a way to make subjects compliment with each other with any combinations, for example, in your English subjects, geography, legal studies and religion you could be expecting to write a lot of essays, answer short answer questions as well. For 2 unit maths and physics you would be practising your mathematical abilities as well as critical analysis, as long as you can make links between subjects and within subjects-so discovering how these subjects can compliment-finding the links within-you shall have a much better chance at doing well in these subjects and more importantly, ENJOYING THE PROCESS-and thus, you can maximise your potential in entering Aeronautical Engineering with the adequate ATAR required. Hope this post helps and all my best wishes for you to succeed in your preliminary and HSC year