UPSC Prelims 2025: Number System PYQs (2020-2024) | CSAT Marathon | StudyIQ IAS

This video offers a comprehensive review of Number System questions from UPSC Prelims 2020‑2024, highlighting recurring patterns, common traps, and shortcuts for LCM/HCF, divisibility, and remainders. It also predicts likely 2025 topics and shares time‑saving strategies for the CSAT section. Viewers can receive a free PDF compilation of past questions by commenting "CSAT".