To practice quantitative aptitude for the UPSC exam, candidates can utilize various resources including online platforms, mobile applications, and physical books. Websites like Testbook and Unacademy provide structured courses and mock tests specifically tailored for UPSC. Additionally, solving previous years' question papers and taking timed quizzes can enhance speed and accuracy. Joining study groups or online forums can also foster collaborative learning and share resources, making preparation more effective. Regular practice and self-assessment are key to mastering this area.