Hello

The syllabus of JEE (Main) will consist of the topics from 11th and 12th standard syllabus. If you are appearing for the JEE Main exam in April then you should focus on the chapters which carry more weightage.

Go through the link below to check the listof important chapters-

https://engineering.careers360.com/articles/jee-main-2019

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Hi dear,

All chapter are important.There are many chapter which contains one question but they are very short and easy so you cannot ignore them.But here is some important topics 

For math

1.Coordinate geometry

2.calculus (go for limits, continuity and AOD these are easy and scoring).

3.trigonometry(scoring topic).

4.Matrix (very easy and scoring)

For chemistry

All topics are important but go for physical chemistry,p,dand f block elements,{polymer,everyday life,g general isolation of metals,}these are very easy you shoulder read ncert once then you will able to solve all question.

For physics

1.electrostatic and magnetism

2.optics

3.modern physics(very easy and scoring)

Hope it helps

For scoring

• Units &dimensions
• Complete modern physics
• Moment of inertia
• Fluid mechanics
• Complex compounds
• Biomolecules
• Chemistry in daily life
• Mathematical reasoning
• statistics

For no of questions: 

• Current electricity
• Magnetics
• Emi
• Modernphysics
• Coordinate complex
• Atomic structure
• Chemical bonding
• Complete algebra
• Complete calculus
• Approximately 4 question from coordinate geometry.
• 

Hii

All the chapters of all the 3 subjects are important, you can not leave anything but yes some chapters are given more weigtage while others have less weightage. Here is a list of chapters which have more weightage. This would help you in your preparations.|
Mathametics - 

• Complex numbers
• Quadratic equations
• Coordinate geometry
• Calculus
• 3D and Vector
• Bionomial Theorem 
• Sequence and series

Chemistry - 

• Chemical bonding and molecular structure
• Chemical Thermodynamics
• Electrochemistry
• Inorganic chemistry ( this is very important part for JEE)
• Organic chemistry of Class 12th ( 11th organic is also important but has lower weightage)
• Polymers and biomolecules
• Environmental Chemistry

Physics - 

• Electrostatistics
• Current Electricity
• Magnetic effects of current and Magnetism
• Electromagnetic induction
• Alternating current
• Optics
• Dual Nature of matter
• Thermodynamics
• Oscillations and wave

You can refer to follwoing link to know the chapterwise weightage- https://engineering.careers360.com/articles/jee-main-syllabus-weightage

Hope this helps
Thanks!