Hey,
The important chapters and the concepts of Physics from class 12th that are important for JEE Advanced include:
Coulombs law; Electric field and potential; Electrical potential energy of a system of point charges and of electrical dipoles in a uniform electrostatic field; Electric field lines; Flux of electric field; Gausss law and its application in simple cases, such as, to find field due to infinitely long straight wire, uniformly charged infinite plane sheet and uniformly charged thin spherical shell.Capacitance; Parallel plate capacitor with and without dielectrics; Capacitors in series and parallel; Energy stored in a capacitor.
Electric current; Ohms law; Series and parallel arrangements of resistances and cells; Kirchhoffs laws and simple applications; Heating effect of current.
BiotSavarts law and Amperes law; Magnetic field near a current-carrying straight wire, along the axis of a circular coil and inside a long straight solenoid; Force on a moving charge and on a current-carrying wire in a uniform magnetic field.
Magnetic moment of a current loop; Effect of a uniform magnetic field on a current loop; Moving coil galvanometer, voltmeter, ammeter, and their conversions.
Electromagnetic induction: Faradays law, Lenzs law; Self and mutual inductance; RC, LR and LC circuits with d.c. and a.c. sources.
Rectilinear propagation of light; Reflection and refraction at plane and spherical surfaces; Total internal reflection; Deviation and dispersion of light by a prism; Thin lenses; Combinations of mirrors and thin lenses; Magnification.
Wave nature of light: Huygens principle, interference limited to Youngs double-slit experiment.
Atomic nucleus; , and radiations; Law of radioactive decay; Decay constant; Half Life and mean life; Binding energy and its calculation; Fission and fusion processes; Energy calculation in these processes.
Photoelectric effect; Bohrs theory of hydrogen-like atoms; Characteristic and continuous X-rays, Moseleys law; de Broglie wavelength of matter waves.
Hope this helps.
Good luck.

hi Anjali,

TO get into IIT you have to clear JEE Advanced which consist of Physics, Chemistry and Maths. I am providing you the link for detailed syllabus below

JEE Advanced syllabus chapter wise

JEE Advanced syllabus topic wise

I hope this answer will help.
All the best for the future!!