Greetings of the day !!

See , we can blindly trust on ncert for the chemistry portion. As we can say the ncert is the father of chemistry in all aspects. As ncert of chemistry contains all the concepts that will ask in the jee mains exam. So you don't have to study from any other book. Yes , you can take book for the reference for practising the varieties of questions but for reading ncert is enough. Most commonly , inorganic and organic chemistry you should read from ncert.

I hope it helps.

Good luck :-):-)

hello aspirant,

Although you must read all the chapters of Physics, chemistry and Mathematics from NCERT Textbooks because the NCERT books Offers a proper basics and clear understanding of each and very concepts which is very essential for JEE mains. But, for your concern query, below are some of the most important chapters/topics from every subjects that you must read thoroughly from NCERT for JEE Mains :

(Physics)

• Dimensional Analysis
  
• Gravitation
  
• Electrostatics
  
• Current Electricity
  
• Heat Transfer
  
• Electromagnetic Induction
  
• Waves & Sound
  
• Geometrical Optics
  
• Thermodynamics
  
• Kinetic Theory of Gases
  
• Rotational Dynamics
  

(Chemistry)

• Chemical Bonding
  
• Periodic table
  
• Carbonyl Compounds and their derivatives
  
• Redox reactions, Mole Concept and the concept of equivalents
  
• Solid state, solutions and gases theory
  
• Thermochemistry and the Second Law of Thermodynamics
  

(Mathematics)

• Differential Calculus
  
• Integral Calculus
  
• Coordinate Geometry
  
• Co-ordinate Geometry (3-D)
  
• Matrix & Determinants
  
• Probability
  
• Matrix & Determinants
  
• Trigonometry
  

Further, below I am recommending some of the best Books for the preparation of JEE mains for all subjects :

JEE Main Books Important for Mathematics

Trigonometry by S. L. Loney

Higher Algebra by Hall & Knight

Maths XI & XII by NCERT

Coordinate Geometry by S. L. Loney

Problems in Calculus of One Variable by I.A. Maron

JEE Main Books for Physics

Problems in General Physics by I.E. Irodov

Fundamentals of Physics by Halliday, Resnick & Walker

Concepts of Physics Vol I and II by H.C. Verma

Books for JEE Main Chemistry

Organic Chemistry by Paula Bruice Yurkanis

Organic Chemistry by Morrison & Boyd

Inorganic Chemistry by J.D. Lee

Numerical Chemistry by P. Bahadur

Further, For more information and complete details about the JEE mains tips and strategies and about the subject wise weightage in JEE mains, you can follow the belwo link :

https://engineering.careers360.com/articles/jee-main-preparation-tips

I hope that this will help.