Improving vocabulary for UPSC exams can be achieved through consistent reading and active engagement with language. Candidates should read diverse materials, including newspapers, books, and academic articles, to encounter new words in context. Maintaining a personal vocabulary journal to record new terms and their meanings encourages retention and revision. Utilizing vocabulary-building apps and engaging in word games can further enhance skills. Practice incorporating new vocabulary into written and spoken communication to familiarize oneself with usage. Regularly challenging oneself to write essays or answer questions using rich vocabulary improves overall expression and clarity, essential in the examination.