Candidates can tackle unexpected questions in interviews by maintaining calmness and clarity. They should listen carefully to the questions, ensuring complete understanding before responding. Preparing a range of topics beforehand helps to build confidence, while practicing with mock interviews improves adaptability. Utilizing a structured approach, like the STAR method (Situation, Task, Action, Result), can guide answer formulation. Emphasizing personal experiences and relevant insights enriches responses, showcasing both analytical skills and personal growth.