The Australian Citizenship 2021 app by Wei Zhang is designed to help you prepare for the Australian Citizenship Test. The app is available on the iPhone platform and falls under the Education & Reference category. It features five modes, including TEST, STARRED, REVIEW, CRAMMING, and LISTEN.

The TEST mode randomly selects 20 questions from the question bank to simulate the actual exam. The STARRED mode allows you to save questions you find challenging. In REVIEW mode, you can test your knowledge with all the questions in the bank. The CRAMMING mode reveals all the answers in the bank to help you memorize the question and answer combinations quickly. Lastly, the LISTEN mode automatically plays all the questions and answers audio sounds without touching your phone.

The app is based on the official document, Australian Citizenship: Our Common Bond, and covers the testable sections that contain information on Australia and its people, Australia's democratic beliefs, rights and liberties, and government and the law in Australia. To pass the test, you need to answer 15 out of 20 questions correctly, and the app's TEST mode will help you practice until you feel confident enough to take the citizenship test.