I have left 4-5 chap in physics chemistry now how i start preparation in these few months for neet 2020 ? is these few months are enough to crack neet ? how can i cover those pending chapters ?

4-5 chapters over a period of 5- 6 months means you can nail the subjects. It also means you have ample of time for practise. Practise as many as mock tests as you can and keep.memorisong the formulae, periodic table and other important topics. These books might help you as well:

Physics Best Books:

NCERT Physics Class XI & Class XII
Concepts of Physics by H. C. Verma
Objective Physics By DC Pandey
Fundamentals of Physics by Halliday, Resnick and Walker
Fundamental Physics by Pradeep
Problems in General Physics by IE Irodov

Preparation tips:

Physics needs utmost focus and time because it involves with theoretical concepts and numbers. There should be a systematic approach in preparing for NEET. The important topics are Mechanics, ElectroDynamics, Modern Physics, Heat and Thermodynamics, Optics, Simple Harmonic Motion, Waves. Formulae form an integral part of your preparation. Memorise as many formulae as you can and write them down and stick them as post its so that you can always see them. Practise regularly and try various kinds of questions. Solving previous papers and mock tests to test your improvement. Keep a clock and check the time its taking you to solve these questions. And improve the time as you practise more. One day of the week should be set aside for revision so as to keep the mind fresh. For reading what the toppers and experts have to say, please visit our page at: https://medicine.careers360.com/articles/how-prepare-for-neet-physics/amp

Chemistry Best Books:

NCERT Chemistry textbooks for Class XI and XII
Physical Chemistry by OP Tandon
ABC of Chemistry for Classes 11 and 12 by Modern
Concise Inorganic Chemistry by JD Lee
Dinesh Chemistry Guide
Practise books by VK Jaiswal, MS Chauhan and N Awasthi

Preparation tips:

Chemistry is divided into Inorganic, Physical and Organic chemistry. For inorganic chemistry, you must refer to the NCERT. Organic comprises of many reactions and reagents which can be practised by writing over and over again. Physical chemistry requires a comparatively deeper understanding of concepts, so preparing with the NCERT and referring to study material a level higher than NCERT should be the way to go. For more information, please visit our page at:
https://medicine.careers360.com/articles/how-prepare-for-neet-chemistry