Key trends in the UPSC exam over the past decade include a noticeable shift towards interdisciplinary knowledge and the incorporation of current affairs into the syllabus. There has also been an increased emphasis on analytical and critical thinking skills, moving away from rote memorization. Furthermore, the UPSC has introduced changes in the pattern and structure of the examination, such as the introduction of negative marking in prelims and a greater focus on ethics in the Mains exam, reflecting the changing societal needs and governance challenges.