In Choose odd Letter Group type questions, usually five groups of letters are given. Four of them are similar to each other in some manner while one is different and this is to be chosen by the candidate as the answer.
VYXW , PSRQ , CGEF , JMLK
In all other groups, the first letter is moved 3 steps forward to obtain second letter,
and second and third letters are each moved one step backward to obtain third and fourth letters respectively.