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.
KP , MN , HR , GT , EV
In all other groups, the first letter occupies the same position from A onward as the second letter occupies from Z backward. e.g., K is the eleventh letter from the beginning and P is the eleventh letter from the end of the alphabet.