An effective study plan for UPSC preparation should be structured, realistic, and tailored to individual strengths and weaknesses. Candidates should begin by analyzing the syllabus and identifying key topics to prioritize. Setting specific, measurable goals with deadlines aids in tracking progress. It's essential to incorporate regular revisions and practice through mock exams or tests. Flexibility is crucial; candidates must adjust their plans based on performance and unforeseen circumstances while ensuring a balanced approach that includes both study and leisure time for mental well-being.