First of all there is no separate AIIMS examination from 2020. Everything will be done on a single mode EXAM common for everyone that is NEET.

I'll enlist down the syllabus -

Physics - you'll have circular motion, rotational motion, oscillations, Kinemetics, work energy and power, current electricity, electrostatics, electromagnetic induction, magnetic effects of electric current, magnetism, atoms molecules and nuclei, semiconductors, electrons and photons, elasticity, surface tension, force, friction, laws of motion, physical world and measurement, gravitation, ray optics, refraction of light, thermodynamics, kinetic theory, stationary waves, wave motion, wave theory of light.

Chemistry -

Some basic concepts of chemistry, states of matter, structure of atom, periodic table, redox reaction, nature of chemical bonds, chemical equilibrium, hydrogen, s block, p block, Alkanes, alkenes, alkynes, aromatic compounds, environmental chemistry, solid state, solutions and colligative properties, electrochemistry, thermodynamics, chemical kinetics, surface chemistry, general principle of isolation techniques, p block, d and f block, coordination compounds, haloalkens and haloarenes, aldhydes ketones, nitrogen containing compounds, polymers and Biomolecules.

Biology -

Reprodution, diversity in living organisms, genetics and evolution, structural organisation in plants and animals, biology and human welfare, cell structure and function, biotechnology, ecology, plant physiology and Human physiology.

Refer to our website to know the detailed syllabus along with the best books required for the same..

https://medicine.careers360.com/articles/neet-syllabus

Best wishes. Thank-you.