If the letters in the word "PSCEXAM" are rearranged according to the English alphabetical order, how many letter(s) will remain in the same position after the rearrangement?

Let's lay out the original index positioning of each letter in the word PSCEXAM:
| Position | $1$ | $2$ | $3$ | $4$ | $5$ | $6$ | $7$ |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Original Letter | P | S | C | E | X | A | M |

Now let's sort all these seven letters alphabetically: A, C, E, M, P, S, X.

Let's align and compare them side by side with their original positions:

| Position | Original Letter | Rearranged Letter | Match Status |
| --- | --- | --- | --- |
| 1 | P | A | No Match |
| 2 | S | C | No Match |
| 3 | C | E | No Match |
| 4 | E | M | No Match |
| 5 | X | P | No Match |
| 6 | A | S | No Match |
| 7 | M | X | No Match |

Comparing each vertical column index, not a single letter retains its original position. Therefore, the answer is $0$.