Developing a robust study plan for UPSC preparation involves setting clear goals, creating a realistic timetable, and allocating time for different subjects and revision. Familiarizing oneself with the syllabus and previous years' question papers can help identify key focus areas. Balancing general studies with optional subjects and incorporating current affairs into the daily schedule is crucial. Regularly assessing progress allows for adjustments in the plan as needed. Ensuring adequate downtime for rest and relaxation is essential for sustaining motivation and energy.