Resources for practicing quantitative aptitude for UPSC include books like R.S. Aggarwal and NCERT mathematics texts. Online platforms such as test series and mock exams offer real-time practice. Utilizing apps that provide quantitative questions enhances speed and accuracy. Joining coaching institutes that provide specialized aptitude training can also be beneficial. Using quantitative reasoning in everyday life additionally solidifies concepts and improves problem-solving skills. Integration of such varied resources helps build a strong foundation in quantitative aptitude, essential for competitive exams like UPSC.