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.
YXVZ , QPMR , KJHL , DCAE
In all other groups, first and second letters are respectively moved one and two steps backward to obtain second and third letters respectively,
while the third letter is moved four steps forward to obtain the fourth letter.