So the first thing you are going to do in regard to this SAC is choosing your topic. It can be quite overwhelming being able to choose to speak about anything in the newspaper over the past year, just because there are so many options! A good way to narrow it down is before even looking in the paper, think of topics you are interested in such as hobbies, TV shows, movies, celebrities, etc. Once you have found a topic that you're interested in, it becomes a lot easier to look in the newspaper for good articles to base your speech on. Say for example you know you want to write a speech about fashion, it's very easy to search on Google for newspaper articles relating to fashion. It will save you time by knowing exactly what topics you are looking for in the newspaper.
Make sure you choose a topic that you are interested in. You have to put in a lot of time researching and putting together your speech so it would be a huge shame to write it on a topic that you don't care about. You also may be asked some questions at the end of your speech by your teacher so you need to make sure you have enough background knowledge to answer those questions confidently. If you write a speech on a topic that you aren't interested in, it will show in the way you present your speech. You will actually perform a lot better preparing a speech about a topic you are invested in which will lead to a better SAC mark. Don't worry about doing a topic that seems intellectual like politics (if you aren't interested in it), some of the best speeches are ones about the most basic ideas such as hobbies or music.
Also, try to dig a bit deeper than the most topical articles because you want to make your speech stand out. When I completed my oral presentation, almost half of my class wrote speeches about the ban on single-use plastic bags. Even though these issues are important, you will simply blend in if you write about the same topic that everyone else will be writing about. If you are interested in a very topical issue, try to write your speech from a different angle or a viewpoint that is not so often heard. For example, instead of writing simply about the ban on single-use plastic bags, you could write about Australia being a lever for change with this new law and create a speech about Australia being very environmentally aware.