Recommended educational resources for mastering quantitative aptitude for UPSC include a mix of preparatory books and online courses. Popular books like R.S. Agarwal and Quantitative Aptitude for Competitive Examinations provide comprehensive coverage of essential topics. Online platforms such as Unacademy or Coursera offer structured courses that incorporate interactive problem-solving sessions. Additionally, practice through previous years' papers and mock tests is crucial to gauge progress and build confidence. Developing a strong foundation in arithmetic, algebra, and data interpretation is essential for success in the examination.