Students, if the topic is biased, it may involve deep knowledge or very novel questions. In the first case, I suggest you think about it first, and then check the information. In the second case, you should first think about which piece of knowledge it tested, and then recall what the teacher said when talking about that piece of knowledge, and the corresponding problem-solving methods. Also, the off-topic may have problem-solving skills. You should consider these three aspects. Finally, the homework should be finished.