Here is the chapterwise weightage of Physics, NEET 2020.

Physical-world and measurement 2%
kinematics 3%
Laws of Motion 3%
Work, Energy and Power 4%
Motion of System of Particles and Rigid Body 5%
Gravitation 2%
Properties of Bulk Matter 3%
Thermodynamics 9%
Behaviour of Perfect Gas and Kinetic Theory 3%
Oscillation & Waves 3%
Electrostatics 9%
Current Electricity 8%
Magnetic Effect of Current & Magnetism 5%
Electromagnetic Induction & Alternating Current 8%
Electromagnetic Waves 5%
Dual Nature of Matter and Radiation 6%
optics 10%
Atoms & Nuclei 3%
Electronic Devices 9%

To prepare the basics of Physics, you must follow NCERT Textbooks of Class 11 and 12. Once done with the NCERTs you can move on to standard reference books like HC Verma, Problems in General Physics by IE Irodov for complex problems and concepts. Then solve last few years' exam papers and give mock tests.
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