at first you have to clear your query. Then i should answerd this.

Hey.

Here is a list of important topics for Mathematics for WBJEE 2019.

Algebra

 A.P., G.P., H.P.  

Complex Numbers

 Quadratic Equations

 Logarithms

 Permutation and combination

 Matrices

 Sets, Relations and Mappings

 Principle of mathematical induction  

Statistics and Probability  

Trigonometry  

Application of Calculus  

Calculus  

Differential calculus

 Coordinate geometry  of three dimensions

 Second order derivative

 Integral calculus  

Vectors