With the UPSC Prelims 2026 results declared, qualified candidates must avoid common mistakes that could affect their chances in the next stage. From missing the mandatory June 19–28 application window to delaying Mains preparation, neglecting answer-writing practice and overlooking optional subjects, experts warn that small errors can have significant consequences. The article outlines key pitfalls to avoid as 13,343 shortlisted candidates prepare for the Civil Services Main Examination beginning on August 21, 2026.