Notable trends in UPSC exam patterns over the years include changes in the syllabus, question styles, and weightage given to specific subjects. There has been a growing emphasis on current affairs and interlinking concepts, indicating the importance of real-world application of knowledge. The introduction of more analytical and application-based questions in recent years highlights the need for candidates to have a comprehensive understanding rather than rote memorization. Additionally, the adoption of negative marking in the Prelims has made it crucial for aspirants to employ strategic guessing and precision in answering.