Common mistakes made by candidates during UPSC preparation include several pitfalls that can undermine their success. A frequent error is ineffective time management, leading to procrastination or unbalanced preparation across subjects. Additionally, many aspirants often focus excessively on one or two subjects while neglecting others, which can limit overall performance. Misunderstanding the exam pattern and syllabus can also result in misdirected study efforts. Lastly, failing to practice answer writing can hinder effective communication during exams. Recognizing and addressing these mistakes is essential for a successful UPSC preparation journey.