In their answer sheet for the **UPSC Mains**, candidates should include important aspects such as the question number clearly marked for each answer and adherence to the prescribed word limit. They must write legibly and ensure their answers are structured logically, often starting with an introduction, followed by detailed content, and concluding with a summary. Diagrams or flowcharts, where applicable, can enhance clarity. Proper formatting and neat presentation contribute positively to the evaluation process.