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.
BYX , LPO , EVU , FUT , IRQ
In all other groups, the first and second letters occupy the same position in the alphabet from the beginning and the end respectively. The second letter is moved one step backward to obtain the third letter.