Hello,

Some changes that will be conducted in the new pattern are:

• Four sessions of the exam instead of two. The Paper 1 exam will be held in February, March, April and May. ( BTech students)
• Paper 1 will now consist of 90 questions where 20 questions will be asked in section a and 10 in section b.
• You can answer a total of 75 questions – 20 questions in section a and 5 questions in section b for each subject – Physics, Chemistry, and Maths.
• The question papers will be set in 13 different languages.

In simple words 25 questions of PCM subjects .total questions 90 and you have to attempt only 75 in section A.

Section B which are numerical ones so 10 of each PCM. So you to attempt only five in each subject.

That's why the total is 300 marks and 90 questions.

You know that four marks for correct answer is there right.

Section A will be of Multiple-Choice Questions (MCQs) and

Section B will contain Questions whose answers are to be filled in as a numerical value. In Section B, you have to attempt any five questions out of 10. There will be no negative marking for s ection B.

https://engineering.careers360.com/articles/jee-main-exam-pattern

hope this helps!!!!