Hi friend below I am giving you the important topics for the IIT JEE Maths according to the weightage

Die Chapters (Most Important)
Probability
Topic Weightage: 7%

Definite Integration
Topic Weightage: 6%

Circles
Topic Weightage: 6%

Vectors
Topic Weightage: 5%

Theory of Equations
Topic Weightage: 5%

Sequences and Series
Topic Weightage: 5%

Complex Numbers
Topic Weightage: 5%

Three Dimensional Geometry
Topic Weightage: 5%

Matrices Determinants
Topic Weightage: 4%

Sets, Relations and Functions
Topic Weightage: 4%

Differential Coefficient
Topic Weightage: 4%

Some other important chapters

Application of Derivatives
Topic Weightage: 4%

Trigonometric Ratios and Identities
Topic Weightage: 3%

Parabola
Topic Weightage: 3%

Limits
Topic Weightage: 3%

Heights and Distances
Topic Weightage: 2%

Straight Lines
Topic Weightage: 2%

Permutation and Combination
Topic Weightage: 2%

Continuity and Differentiability
Topic Weightage: 2%

Differential Equation
Topic Weightage: 2%

Inverse Trigonometry
Topic Weightage: 2%
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