According to jee mains 2020 , new paper pattern is 25 questions eachnin maths , physics ,and chemistry .then ur site says 30 questions each
Here's the exam pattern:
Subjects
Physics, Chemistry, and Mathematics
Total number of questions
75 (Each subject will have 25 questions)
Type of Questions
20 Objective questions having 4 options each with only 1 correct option
5 Numerical questions with numerical value as answer
Marking Scheme
For MCQs - 4 Marks will be awarded for every correct answer and 1 Mark will be deducted for every incorrect answer
For answer with numeric value - 4 Marks will be awarded for every correct answer and 0 Mark will be deducted for every incorrect answer.
https://engineering.careers360.com/articles/jee-main-exam-pattern
I hope this helps.

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