To effectively understand international relations for UPSC, candidates can adopt several strategies. Firstly, studying major theories such as realism and liberalism provides a foundational understanding. Following key global events, treaties, and their implications can help contextualize theoretical concepts. Engaging with current affairs through reputable sources ensures aspirants stay updated on international dynamics. Additionally, practicing answer writing on contemporary issues helps in articulating insights clearly during exams and interviews. Building a timeline of significant events aids in grasping the broader geopolitical landscape.