Simulating exam-like conditions while solving previous years question papers of UPSC Mathematics optional subject is crucial to enhance your exam preparation and improve your performance. Here are some effective strategies to create an exam-like environment:

1. Time Management:
- Allocate a fixed amount of time for each question or section, just as you would have in the actual examination.
- Use a timer or stopwatch to keep track of time and ensure that you complete the paper within the prescribed time limits.

2. Exam Hall Setup:
- Find a quiet and distraction-free environment to solve the question papers.
- Sit at a desk or table with all the necessary materials, such as pen, paper, calculator, etc.
- Avoid using any external resources or materials that you would not have during the actual exam.

3. Strictly Follow Exam Rules:
- Adhere to the UPSC exam rules and guidelines, such as not carrying any prohibited items, maintaining silence, etc.
- Do not take any breaks during the exam duration unless it is allowed as per the rules.

4. Mock Tests:
- Take regular mock tests to familiarize yourself with the exam pattern, time constraints, and overall exam conditions.
- EduRev provides previous years' question papers as well as mock tests for UPSC Mathematics optional subject. Utilize these resources to practice in an exam-like environment.

5. Analyze Performance:
- After completing the question paper, evaluate your performance objectively.
- Identify the areas where you faced difficulties or made mistakes, and prioritize working on those specific topics.
- Review the solution to each question to understand the correct approach and learn from any mistakes or misconceptions.

6. Self-discipline and Focus:
- Develop self-discipline and maintain focus throughout the entire duration of the exam.
- Avoid any distractions, such as checking your phone or engaging in unrelated activities, during the exam.

7. Revision and Practice:
- Regularly revise the important concepts and formulas to strengthen your understanding.
- Solve a variety of previous years' question papers to get acquainted with different types of questions and improve your problem-solving skills.

By following these strategies, you can create an exam-like environment while solving previous years' question papers of UPSC Mathematics optional subject. This will help you build your confidence, enhance your time management skills, and improve your overall performance in the actual examination. Remember to stay focused, practice consistently, and analyze your performance to identify areas for improvement.