공풀 is an educational app designed to aid students preparing for civil service examinations. It offers a vast collection of 53,786 past exam questions, covering the last 15 years of test materials. The app allows users to approach these questions through various formats, including modified questions and true/false formats, enhancing strategic learning. Additionally, users can create personalized vocabulary lists focusing on essential terms for the exams.

The app features a unique review system that automatically saves incorrect answers into a personal error notebook, facilitating focused revisions. It also includes real-time rankings and missions to motivate users, turning study sessions into an engaging experience. Overall, 공풀 provides a structured and interactive approach to mastering civil service exam content, making it an invaluable resource for candidates.