How to analyse questions in GATE..

first look at the problem and note down what is given and what you have to find out.
Then try to relate that problem with any problem that you have solved previously or with some concepts
 you learnt from that subject. Actually they don't create new problem, they just modify the way
of asking the same question.

If it is difficult problem to solve then use elimination trick.
Eliminate all options out of four that you are sure that they cannot be the answers
. Then chose from the remaining options with some logic.

If you solve around 20 previous year question papers in this month,
then you will get habitual to analyse the question easily.