Candidates should tackle the environmental science syllabus in UPSC examinations by adopting a structured approach. Beginning with foundational concepts such as ecology and biodiversity sets a strong base. Regular updates on current environmental issues, including policies and challenges, keep knowledge current. Engaging with case studies and real-world examples enhances understanding of theoretical concepts. Additionally, practicing answer writing specific to environmental topics helps in articulating critical arguments effectively. Mock tests focused on this syllabus further consolidate comprehension and retention.