hello,
The subject wise total number of question in WBJEE is
In chemistry 30 Questions is asked in Category 1and 5 Questions each in Category 2 and 3. In category 1 each correct answer will be awarded one mark and in category 2 for every correct response, two marks will be given by the candidates. The total marks allotted in Chemistry is 50. In WBJEE organic chemistry chapter has 6% weightage. So, apart from organic chemistry you can get around 32-35 questions from other chapters.
You can check the link below to know more about WBJEE exam pattern
https://engineering.careers360.com/articles/wbjee-exam-pattern
Good luck!
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