Hello karthick

There will be total 65 questions in your exam and total marks will be 100 and exam duration will be 3 hours. 

Two types of questions will be asked in your exam

Multiple Choice Questions (MCQ)

Numerical Answer Type (NAT) Questions

-For 1-mark MCQs, 1/3 mark will be deducted for every incorrect attempt.

-In case of 2-mark MCQs, the candidate will be penalised 2/3 mark for wrong attempt.

-There is no negative marking for numerical answer type (NAT) questions.

To know in detail you can refer below link

https://engineering.careers360.com/articles/gate-exam-pattern/amp

Regards