Hello, 

The chapter wise distribution of subjects are different for different three subjects. Here I'm giving you the list of important chapter with high waitage in neet of all subjects

Biology - reproduction (unit-1 12th) , inheritance , organisms and population , plant physiology , animal and plant kingdom.

Physics- lows of motion ( very imp) kinematics , electrostatic, work energy and power, optics

Chemistry- organic , chemistry in every day life, solutions , elctrochelectroc, inorganic 

Hello Meghna,
In order to score a good marks in the NEET examination, you should read NCERT books of Physics, Chemistry & Biology of class 11th & 12th at least 2 or 3 times for basics, your basics should be very clear upto class 12th. After that HC Verma for Physics (part -1&2), Biology by Trueman (volume-1&2) and Pradeep Guide on Biology, OP Tendon for Physical & Inorganic Chemistry, and Organic Chemistry of "Arihant Publication" for detail or extra knowledge. You can also read more books whose names are given in the link given below
Https://medicine.careers360.com/articles/best-books-for-neet
You should also try to solve the previous years question papers, this helps too much and you should also give the mock test to rectify yourself and build your confidence level.
First of all, the main thing is that you have to build your concentration level, then only you can stay focused on your goal. I would like to say that please limit the study time between 10 to 12 hours and please increase your concentration and speed of reading, understanding and solving the problems then you will not face any kind of difficulty.
For preparation of exam, the most important thing is your confidence after that you should know the whole syllabus and make your plan properly for learning new chapters, solving the numericals and revision. All three things should be the part of your preparation strategy in daily routine.
To know more about preparation tips, syllabus, important topics, prevoius year questions with the solution, chapter wise weightage & the best books, you may visit the link given below
Https://medicine.careers360.com/articles/neet-2019
https://medicine.careers360.com/articles/neet-chapter-wise-weightage-and-important-topics


In this way you will be able to prepare yourself well and score a good marks in the NEET exam. 
Thanks for query on this platform, you may visit again
All the best for your examintion.

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