Commonly recommended materials for UPSC Civil Services preparation include standard textbooks, current affairs magazines, and government publications. Some key resources are NCERT books for foundational knowledge, along with rigorous materials from authors like Ramesh Singh for economics and Laxmikant for polity. Additionally, monthly magazines like Yojana and Kurukshetra are valuable for current affairs. Online platforms and coaching materials can also provide further insights. Candidates should focus on quality resources, ensuring a broad yet deep understanding of each subject area to maximize their preparation efficacy.