Major reforms introduced in the UPSC Civil Services examination pattern include a shift towards a more integrated approach in the syllabus, incorporating subjects relevant to contemporary governance and public administration. The introduction of a personality test aims to evaluate aspirants on leadership qualities and interpersonal skills. Additionally, changes in the exam structure have been made to include negative marking in prelims, ensuring that candidates are graded more fairly. These reforms seek to enhance the overall quality and relevance of the selection process.