Several organizations provide valuable study materials for UPSC preparation. Renowned coaching institutes like Chanakya IAS Academy and Vision IAS offer comprehensive resources, including study books, test series, and online courses. Additionally, platforms such as Unacademy and BYJU'S provide interactive learning modules and video lectures, making complex topics accessible. Many non-profit organizations like Drishti IAS also contribute free resources, including pamphlets and summarized notes. Utilizing materials from these organizations can enhance an aspirant's preparedness and understanding of the UPSC syllabus.