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.
ACZX , BDYW , EGVT , GITR , CEUS
In all other groups, first and second letters are alternate, fourth and third are alternate.
But, third letter has same backward position from Z as is the forward position from A, occupied by first.