Methods to improve focus during lengthy study sessions for UPSC include incorporating short, structured breaks every 25-50 minutes to prevent fatigue. Using tools like written schedules with clear tasks keeps candidates on track. Practicing mindfulness or meditation techniques enhances concentration and reduces distractions. Creating a decluttered study environment promotes clarity and retains focus. Additionally, varying study methods by including visual aids, discussions, and teaching concepts to others can maintain engagement, ultimately improving the effectiveness of study sessions.