JEE Main

Hello,
Let me go subject wise. You can refer the following important chapters from which questions do come and they also have high weightage.
PHYSICS:
Basic concepts:
1)Units and Dimensions
2)Measurement of errors
3)Vectors
Fundamental and easy scoring concepts:
1)Work, Energy and Power
2)Electrostatics
3)Current Electricity
4)Wave Optics
5)Ray optics
6)Semiconductor and electronic devices
Very important chapters:
1)Centre of Mass, Momentum and collision
2)Rotational Dynamics
3)Simple Harmonic Motion
4)Fluid mechanics
Bernoullis principle can be easily twisted to ask some tricky questions.
5)Wave Motion and String Waves
6)Magnetism
7)Heat & Thermodynamics
.This is one topic that is very important for both Physics and Chemistry preparation in JEE.
8)Nuclear Physics
9)Modern Physics
CHEMISTRY:
Important topics in Chemistry:
1)Chemical Bonding and the periodic table This is by far the most fundamental and the most important topics in Chemistry. If you can master Chemical Bonding and the properties of periodic table elements, then Chemistry will be an easy subject for you over many years to come.
2)Carbonyl Compounds & their derivatives
3)Redox reactions, Mole Concept & the concept of equivalents
4)Solid state, solutions & gases theory
5)Thermochemistry & the Second Law of Thermodynamics
Fundamental Concepts:
1)IUPAC Nomenclature
2)Periodic Table
3)Chemical Bonding
Like I mentioned earlier, chemical bonding and periodic table is one of the strongest pillars of your Chemistry conceptual understanding.
You can easily get top ranks by making sure your concepts are crystal clear in this topic.
Important, and easy scoring concepts:
1)Mole Concept
2)Co-ordination Chemistry
3)Alcohol, Phenols and Ethers
4)p-Block elements
Important, with High Weightage:
1)Atomic Structure
2)Gaseous state
3)Hydrocarbons
4)Aldehydes and Ketones
5)d & f Block elements
6)General Organic Chemistry
MATHEMATICS :
1)Applications of Derivative
2)Limit and Continuity
3)Matrices and DETERMINANTS
4)Straight Lines and Pair of Straight LINES
5)Inverse Trigonometric Functions
6)Circles and Family of Circles
7)Sequence and Series
8)3-D geometry
9)Probability and Statistics
10)Vector Algebra
11)Integration (Definite + Indefinite integration)
12)Complex Numbers
13)Parabola
14)Trigonometric Ratios