Introduction:
In the numerical problems of Paper I, effective use of mathematical calculations is crucial to arrive at the correct answers. Here are some specific tips to enhance your mathematical calculations and solve numerical problems efficiently.

1. Understand the Problem:
Before jumping into calculations, make sure you have a clear understanding of the problem statement, what is required to be calculated, and any given conditions or constraints.

2. Break Down the Problem:
Break the problem into smaller parts or steps, and identify the key components involved. This will help you organize your calculations and simplify the problem.

3. Use Appropriate Formulae and Concepts:
Ensure that you are using the correct formulae and concepts related to the problem. Familiarize yourself with the relevant mathematical principles and equations to apply them accurately.

4. Substitute Values Carefully:
While substituting values into equations, double-check the units, dimensions, and the accuracy of the values given. Be cautious with decimal points and units conversions if necessary.

5. Use Approximations:
In some cases, using approximations can speed up calculations. Round off numbers to a suitable degree of accuracy to simplify complex calculations and avoid unnecessary calculations.

6. Maintain Neatness and Organization:
Write down your calculations neatly, keeping track of each step. This helps in avoiding mistakes and facilitates easy review if you need to check your work later.

7. Utilize Shortcut Techniques:
Learn and practice shortcut techniques such as mental calculations, estimation, or pattern recognition. These can save time and make calculations more efficient.

8. Verify the Result:
After completing the calculations, always verify your result by checking if it makes logical sense and satisfies any given conditions or constraints. This helps in identifying any calculation errors or incorrect assumptions.

9. Practice and Time Management:
Regular practice of mathematical calculations will improve your speed and accuracy. Time management is also crucial during the exam, so practice solving problems within the given time limit.

Conclusion:
By following these tips, you can enhance your mathematical calculations and solve numerical problems effectively in Paper I. Regular practice, understanding the problem, using appropriate formulae, and maintaining neatness will contribute towards achieving accurate and efficient solutions. Remember to verify your results and manage your time efficiently during the exam.