Candidates can incorporate interdisciplinary approaches in their UPSC mains preparation by blending knowledge from various subjects. They should identify connections between subjects like history, geography, and environmental science and apply this understanding to essay writing and answer formulation. Creating mind maps that visualize these relationships can be beneficial. Furthermore, utilizing case studies that draw from multiple disciplines can enhance analytical skills. Engaging in discussions to draw parallels between current affairs and academic subjects also fosters a deeper understanding, allowing candidates to develop more nuanced answers and viewpoints.