"Australia Day, observed on January 26th, commemorates the arrival of the First Fleet at Sydney Cove in 1788 and the subsequent raising of the Union Flag by Arthur Philip."
Australian Citizenship Test gives you access to many more tests than just the one practice test available on the government website. That official sample test is good for giving you an idea of what to expect on the real test. But it can't help you prepare fully. Nor does reading the Australian Citizenship: Our Bond material alone.