When addressing weaker subjects in the UPSC syllabus, candidates should adopt a structured approach. Start by identifying specific areas that require attention and allocate dedicated time for focused study. Utilize targeted resources, such as summary notes or video lectures, to grasp core concepts efficiently. Additionally, consider engaging in group discussions for collaborative learning and insights. Practicing past years' questions specific to those subjects can improve confidence and clarify doubts. Finally, ensure to monitor progress regularly to make necessary adjustments to the study plan.