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A letter series looks like a memory test. It is not one. Every letter-series question in every paper reduces to a single move: replace each letter with its position number, look at the gaps, then convert back. Once the letters are numbers, the pattern is the same arithmetic you already handle in number series without trouble.
What actually stops students is the conversion. Counting from A on your fingers to reach S costs eight seconds and breaks your train of thought, and under exam pressure that is where the mistake enters — not in the pattern itself.
So the real skill in this topic is knowing the alphabet's positions cold, in both directions, with two or three anchors you can jump from instead of walking up from A each time. That is about a week of drill, and it converts an entire question type from slow guessing into arithmetic. A paper carrying four or five of these is simply handing marks to whoever did the drill.
1. Which letter is the 5th to the right of the 12th letter from the left of the English alphabet?
2. Complete the series: B, D, G, K, P, ?
3. Complete the series: AZ, BY, CX, DW, ?
4. Complete the series: AC, FH, KM, PR, ?
5. In the row 5 P # 3 A K 7 @ 2 M B 9 $ 4 W, how many digits are immediately followed by a letter?
6. Which letter is opposite to G in the English alphabet?
7. Which letter lies exactly midway between E and U in the English alphabet?
8. Complete the series: A, T, B, S, C, R, D, ?