Common study habits that should be avoided during UPSC preparation include cramming, which leads to superficial understanding rather than in-depth knowledge. Additionally, creating unrealistic study schedules can cause burnout and diminish morale. Relying solely on one source of information restricts exposure to diverse viewpoints. Multitasking during study sessions often results in decreased efficiency and retention. Finally, neglecting regular breaks can hinder focus and increase stress levels. Candidates should aim for a balanced, well-structured approach to their studies to maximize effectiveness and retention.