Is it necessary for a candidate to attempt all questions in GATE?

No, in fact a Candidate should note that if he or she is not sure about an answer to a question, they should surely try to avoid that question since there is a negative marking in the GATE examination. It is not mandatory to solve all the 65 questions and one must be totally sure while answering a q

The question paper is divided into two sections: the subject-specific GATE paper worth 85 marks, and the general aptitude (GA), worth 15 marks. 10 questions make up the GA section. There are 2 marks for each question from 1-5 and 1 mark for each question from 6-10. There are 55 questions in the subj

No, it is not mandatory to attempt all questions in GATE. Attempt only those which you are sure of, as the exam follows negative marking. However, you can still put some guesswork for NATs and MSQs, as there is no negative marking for this. 

Negative marking is only applicable on MCQ questions. where