Hello,
From 2020 onwards, the JEE Mains paper 1 patter has 75 questions in total. Each subject of PCM has 25 questions each. Each question is of 4 marks and carries -1 marks for wrong choice. The total marks is of 300 marks. Each subject has 20 MCQ and 5 numerical questions.
Please visit this link for detailed JEE Mains pattern

The exam patter for JEE Advanced changes every year. For the year 2020,
Paper 1
Single Correct Option - 4
One or more option (s) is correct  8
Numerical Value Answer 6

Paper 2
One or more option (s) is correct 8
Numerical Value Answer 6
List Match Sets - 2 Sets (Each set has two multiple-choice questions)

Please visit this link for detailed information about JEE Advanced pattern

Hope it helps

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