Yes, incorporating revision of previous years' question papers into your strategy can be highly beneficial for UPSC preparation. Here are the reasons why:

1. Familiarity with Exam Pattern and Syllabus:
- By solving previous years' question papers, you can understand the exam pattern, question formats, and the weightage of different topics in the syllabus.
- This knowledge will help you prepare strategically by focusing on important topics and allocating time accordingly.

2. Understanding the Question's Demand:
- UPSC questions are known for their depth and analytical approach. By practicing previous years' papers, you can gain insight into the type of questions asked and the level of analysis required.
- This will enable you to develop a better understanding of the question's demand and improve your answer-writing skills accordingly.

3. Identifying Important Topics:
- While preparing for UPSC, it is crucial to prioritize topics that have a higher probability of being asked in the exam.
- By analyzing previous years' papers, you can identify recurring themes, important subtopics, and areas that require more attention.
- This will help you streamline your preparation and focus on the most relevant areas.

4. Time Management:
- UPSC exams have a time constraint, and efficient time management is crucial for success.
- Solving previous years' papers under timed conditions will help you improve your speed and accuracy.
- Additionally, it will give you an idea of how much time to allocate to different sections and how to optimize your performance within the given time frame.

5. Assessing Strengths and Weaknesses:
- Regularly practicing previous years' papers will allow you to assess your strengths and weaknesses in different subjects and topics.
- This self-evaluation will help you identify areas where you need to improve and allocate more time for preparation.
- It will also allow you to track your progress over time and make necessary adjustments in your study plan.

6. Building Confidence:
- Aspirants often feel anxious about the UPSC exam due to its competitive nature and vast syllabus.
- By solving previous years' papers and scoring well, you can boost your confidence and reduce exam-related stress.
- This positive mindset will have a significant impact on your performance during the actual exam.

Incorporating revision of previous years' question papers into your strategy can provide you with valuable insights, improve your understanding of the exam pattern, enhance time management skills, and build confidence. It is an effective method to supplement your preparation and increase your chances of success in the UPSC exam.