which has more weightage 11th or 12th in jee mains?

As both are important but comparatively 12th carries more weightage as you can check the subject wise weightage below as well-

Chemistry - General Organic Chemistry 9% Alcohol Phenol Ether 7% Redox reactions 6% Chemical Bonding 5% Coordination Compound 5% P-Block Elements 5% S-Block Elements 5% Aldehyde Ketone 5% Solutions 5% Solid State 5% Chemical Thermodynamics 5% Ionic Equilibrium 3% Chemical Equilibrium 3% Surface Chemistry 3% Atomic Structure 2% Gaseous State 2% Transition Elements 2% Polymers 2% Nuclear Chemistry 2% Chemical Kinetics 2% Mole Concepts 2% Amines and Diazonium Salts 2% Biomolecules 2% Alkanes, Alkenes and Alkynes 2% Electrochemistry 2%

Maths - Inverse Trigonometric Functions  Weightage: 2% Circles and Family of Circles  Weightage: 6% Sequence and Series  Weightage: 5% Applications of Derivative  Weightage: 4% Limit and Continuity  Weightage: 3% Matrices and Determinants  Weightage: 4% Straight Lines and Pair of Straight Lines  Weightage: 2% 3-D Geometry   Weightage: 5% Probability and Statistics   Weightage: 7% Vector Algebra   Weightage: 5% Integration   Weightage: 8% (Definite + Indefinite integration) Complex Numbers   Weightage: 5% Parabola   Weightage: 3% Trigonometric Ratios   Weightage: 3% Logarithms   Weightage: 1% Quadratic Equations Theory of Equations   Weightage: 5% Sets, Relations and Functions   Weightage: 4% Differentiation  2% Permutation and Combination   Weightage: 2%. You should study this properly as concepts from this section will be needed in Probabilty Binomial Theorem   Weightage: 1% Locus Hyperbola   Weightage: 2% Ellipse   Weightage: 2% Fundamentals of Mathematics Solution of Triangle 1%

Physics - Units and Dimensions  Weightage: 2% Measurement of Errors  Weightage: 2% Vectors Kinematics  Weightage: 1% Newtons Laws of Motion  Weightage: 4% Friction Work, Energy and Power  Weightage: 5% Electrostatics  Weightage: 6% Current Electricity  Weightage: 7% Wave Optics  Weightage: 5% Ray Optics  Weightage: 6% Centre of Mass, Momentum and Collision  Weightage: 5% Rotational Dynamics  Weightage: 4% Simple Harmonic Motion  Weightage: 5% Fluid Mechanics  Weightage: 2  5%.  Wave Motion and String Waves  Weightage: 5% Magnetism  Weightage: 6% Heat & Thermodynamics  Weightage: 6%.Nuclear Physics  Weightage: 5% Modern Physics  Weightage: 5%, Circular Motion  Weightage: 1% Gravitation  Weightage: 1% Properties of Matter, Elasticity  Weightage: 2% Sound Waves Electromagnetic Induction  Weightage: 3% Alternating Current  Weightage: 1% Semiconductors and Electronic Devices 5%.

Hope this helps!!!!

12th class has more weightage in JEE Main exam. Generally, it has 40:60 ratio. 40% for 11th class and 60% for 12th class.

Below are the important chapters for JEE exam-

PHYSICS

Mechanics

Electricity and magnetism

Thermal physics

Fluids and waves and sound

Potentiometer-related experiments

Optics

Modern physics

CHEMISTRY

Physical Chemistry

Mole Concept

Atomic Structure

Organic Chemistry

General Organic Chemistry

Named Reactions

Organic Synthesis:

Inorganic Chemistry

MATHEMATICS

Calculus

Co-ordinate Geometry

Vectors (and 3D Geometry)

Algebra

Trigonometry