In a certain coding scheme, the word SCHOOL is coded as TEKSTR. How will the word OFTEN be coded in the same scheme?

OFTEN is coded as PHWIS.

Each letter shifts forward by its position number.

Check SCHOOL: S+1, C+2, H+3, O+4, O+5, L+6 = TEKSTR.

Apply to OFTEN: O+1, F+2, T+3, E+4, N+5.

This gives P, H, W, I, S = PHWIS.