Common mistakes candidates make during UPSC preparation include inadequate time management and lack of structured study plans. Many aspirants attempt to cover the entire syllabus at once, leading to burnout. Not revising regularly often results in forgetting crucial information. Over-reliance on a single source can lead to gaps in understanding; utilizing multiple resources is essential for comprehensive preparation. Additionally, neglecting current affairs can hinder their ability to connect theoretical knowledge to practical scenarios. Avoiding these pitfalls can significantly enhance the overall effectiveness of preparation efforts.