Hello aspirant,

No it is not mandatory to attempt all tge questions in KEAM. The exam consists of two papers-
Paper 1(Physics,Chemistry)- 120 questions
Paper 2(Maths)- 120 questions

4 marks will be awarded for correct answer and 1 mark will be deducted for wrong answers. So, since there is negative marking you have to be more accurate while attempting the questions.

For detailed info regarding exam pattern-
https://www.google.com/amp/s/engineering.careers360.com/articles/keam-exam-pattern/amp

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