Hello Souvik Dey,

The details of number of questions in the exam are.,

• Physics - 40

• Chemistry - 40

• Mathematics - 75

• Total - 155

When coming to the Category wise questions are.,

• Physics & Chemistry - 30 Questions in Category 1, 5 Questions each in Category 2 and 3.

• Mathematics – 50 Questions in Category 1, 15 Questions in Category 2 and 10 Questions in Category 3.

For more details once visit the below link.,

https://engineering.careers360.com/articles/wbjee-syllabus

Hope this helps you...