Resources for practicing quantitative aptitude for UPSC include numerous online platforms and publications that offer comprehensive study materials. Websites like ClearIAS and Unacademy provide various practice tests and quizzes tailored specifically for UPSC aspirants. Additionally, books such as "Quantitative Aptitude" by R.S. Aggarwal and "Data Interpretation" by Arun Sharma are popular among candidates. Using mobile applications for daily practice can also reinforce learning and improve speed. Enrolling in mock test series further helps in identifying strengths and weaknesses, ensuring focused preparation for the quantitative aspects of the exam.