Preparing for NEET and IIT JEE is a significant endeavor, and a strong foundation in physics is crucial for success in these competitive exams. Here's a general outline of what a 9th-grade student should focus on when preparing for physics for NEET and IIT JEE:

1. Basic Concepts: Start with the fundamental concepts of physics, such as units and measurements, motion, and vectors. Develop a clear understanding of terms like distance, displacement, velocity, and acceleration.

2. Kinematics: Study the equations of motion in one and two dimensions. These equations are essential for understanding the motion of objects.

3. Laws of Motion: Learn Newton's laws of motion. Understand the concepts of force, mass, and acceleration. Pay special attention to the second law (F=ma) and how to apply it.

4. Work, Energy, and Power: Learn the concepts of work done, energy, and power. Understand the relationship between them and how to calculate them in various situations.

5. Gravitation: Study the law of universal gravitation and understand how it applies to objects on Earth and in space.

6. Thermodynamics: Introduce yourself to the basic concepts of temperature, heat, and the first law of thermodynamics. Learn about different thermodynamic processes and understand the concept of internal energy.

7. Oscillations and Waves: Learn about simple harmonic motion (SHM), oscillations, and waves. These concepts are essential in physics and have applications in various topics.

8. Properties of Matter: Study the properties of solids, liquids, and gases. Learn about elasticity, surface tension, and viscosity.

9. Sound: Understand the properties of sound waves, such as frequency, wavelength, and speed. Learn about the Doppler effect and its applications.

10. Optics: Begin with ray optics and study concepts like reflection, refraction, lenses, and mirrors. Also, learn about wave optics and interference, diffraction, and polarization.

11. Modern Physics: While this may not be covered extensively in 9th-grade, you can introduce yourself to the basics of modern physics, including the photoelectric effect and the theory of relativity.

12. Practice and Problem Solving: Solve a variety of physics problems to reinforce your understanding of the concepts. Practice is crucial for both NEET and IIT JEE preparation.

Remember that the 9th-grade is an excellent time to build a strong foundation in physics. Focus on understanding the concepts thoroughly, as this will make it easier to grasp more advanced topics in 11th and 12th grades when preparing for these competitive exams. Additionally, consider using textbooks, online resources, and possibly enrolling in a coaching program if you feel it's necessary.