Please tell me important chapters of physics & chemistry for scoring better marks in neet?

It would be better if you complete the NCERT properly because 70-75% of questions come form there and as per previous years detail, below topics are considered to be very important so kindly prepare them all very nicely-

Important topics- Physics – Optics, Mechanics, Nuclear Physics, Thermodynamics, Chemistry – General Organic Chemistry, Mole Concept, Periodic Table, Coordination Chemistry, Chemical Bonding. Biology – Genetics, Ecology & Environment, Cell
Biology, Morphology, Basics of Biotechnology, Reproduction, Physiology of Animals & Plants.
Good Study Material - The most important element to prepare for any exam is good study materials as better to choose the standard preparation material.

Apart from this, I would suggest you to practice on sample papers as well as these are very helpful to cover all important question -

https://medicine.careers360.com/download/medicine-sample-papers

Good Luck!!!