hello aspirant......

the important topics for neet in physics

kinematics

gravitation

thermodynamics

work,energy and power

electrostatics

optics

current electricit

electromagnectic induction and alternating currents

important chapters in chemistry for neet are

structure of atom

states of matter

s,p,d and f block elements

thermodynamics

electro chemistry

surface chemistry

chemical kinetics

inorganic chemistry

important topics in biology for neet are

human physiology biological classification molecular basis of inheritance

biomolecules

biological classification

animal kingdom

reproduction

ecosystems

i hope this information is helpful

all the best.

Hello,

here is the list for the important chapters with high waitage

For biology it's divided into two that is zoology and botany starting from zoology

Zoology - human reproduction , evolution, immunity, animal kingdom (only from NCERT) 

Botany- plant kingdom, organisms and population, ecosystem, plant reproduction biological classification

This are some very imp chapters with high waitage of biology . Coming to physics and chemistry.

Chemistry- organic (very imp.) , Solutions , chemical bonding (again very very imp) electrochemistry , chemistry in daily life ,.NOTE - do not ignore inorganic chemistry it makes difference during the exam

Physics- laws of motion (v imp) { not many questions ask from this chapter but it's the basic for all the physics chapter don't ignore it} ,,,, optics , work energy and power, electrostatic , current energy 

Hope uh are clear now all the best for ur exam

Hello!

NEET syllabus is entire NCERT books of physics, chemistry and biology so everything is important and has to be read in detail. Check out this link which has the question paper analysis. This can give you a fair idea of the weightage-

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