The IIT JAM Physics exam does not have a specific order in which the sections should be attempted. However, it is recommended to follow a strategic approach to maximize efficiency and optimize performance. Here is a suggested order to attempt the sections:

1. Mathematical Methods:
- Start with the Mathematical Methods section as it is relatively easier and can be completed quickly.
- This section usually consists of questions on calculus, differential equations, matrices, and vector calculus.
- Solve questions that you are confident about and can answer quickly to save time for other sections.

2. Mechanics and General Properties of Matter:
- Move on to the Mechanics and General Properties of Matter section.
- This section typically includes questions on classical mechanics, theory of relativity, fluid mechanics, and thermal physics.
- Focus on solving questions that you are comfortable with and have a good understanding of the concepts.
- Pay attention to numerical calculations and ensure accuracy in calculations.

3. Oscillations, Waves, and Optics:
- Proceed to the Oscillations, Waves, and Optics section.
- This section covers topics such as harmonic oscillators, waves, interference, diffraction, polarization, and optical instruments.
- Start with topics you are confident about and can answer quickly.
- Pay attention to conceptual understanding and numerical problem-solving.

4. Electricity and Magnetism:
- Next, attempt the Electricity and Magnetism section.
- This section usually includes questions on electrostatics, magnetostatics, electromagnetic theory, and electrical circuits.
- Begin with questions that you find easier and can solve quickly.
- Focus on understanding the principles and laws of electricity and magnetism.

5. Modern Physics:
- Lastly, attempt the Modern Physics section.
- This section covers topics such as quantum mechanics, atomic and molecular physics, nuclear physics, and solid-state physics.
- Start with topics that you have a good understanding of and can answer confidently.
- Pay attention to conceptual understanding and numerical problem-solving.

General Tips:
- Allocate time wisely for each section based on your strengths and weaknesses.
- Read the questions carefully and understand what is being asked before attempting to solve them.
- Practice previous years' question papers to get familiar with the exam pattern and time management.
- Revise important concepts and formulas before the exam to ensure better retention.
- Attempt mock tests to assess your preparation level and identify areas that need improvement.

Remember, the order of attempting the sections may vary depending on your individual strengths and weaknesses. It is essential to devise a strategy that works best for you and helps you utilize your time effectively during the IIT JAM Physics exam.