Candidates can summarize large volumes of study material for UPSC effectively by employing techniques such as note-taking, creating mind maps, and utilizing bullet-point summaries. While reading, focusing on key themes, facts, and arguments aids in distilling essential information. Maintaining a study journal can also help organize thoughts and facilitate quick revisions. Additionally, using tools like digital flashcards or summarization apps can enhance retention. Group studies allow candidates to discuss and condense information collaboratively, making the process engaging. Ultimately, effective summarization ensures candidates grasp core concepts and themes, making it easier for efficient revision ahead of the exam.