Lesson plans can improve understanding of complex topics for UPSC by breaking down content into manageable segments. This method allows aspirants to focus on key concepts, establish connections between topics, and engage in interactive learning. Utilizing various teaching aids, such as diagrams or multimedia presentations, enhances engagement and retention. Incorporating practice questions related to the lesson can also help reinforce understanding through application. Overall, structured lesson plans promote systematic study habits, ensuring that candidates fully grasp intricacies in subjects like polity, economy, and geography.