Common pitfalls to avoid while preparing for the UPSC exams include lack of a structured study plan, neglecting current affairs, and failing to practice answer writing. Relying solely on coaching materials without self-study can hinder personal understanding and retention. Additionally, it's vital to avoid burnout by balancing study with relaxation and physical well-being. Last-minute cramming and social media distractions can also lead to reduced efficiency. Recognizing and addressing these pitfalls early on can greatly enhance the effectiveness of an aspirant's preparation strategy.