From statement I-
Statement I: Starting from his school, Naman goes 12m north and turns to his left. After walking 15m, he again turns to his left and meets Nahar who is 24m away from him.

From statement II-
Distance between Naksh and Nahar is multiple of an even number. Naksh is south of Naitik.
Nothing can be concluded.
From statement III-
Naksh is standing 22m to the west of Nishant, who is standing to the southwest of Nahar. Naksh is 27m south of Naitik.

Now combining statements I and III-
Statement I: Starting from his school, Naman goes 12m north and turns to his left. After walking 15m, he again turns to his left and meets Nahar who is 24m away from him.
Statement III: Naksh is standing 22m to the west of Nishant, who is standing to the southwest of Nahar. Naksh is 27m south of Naitik.

The direction of Nishant with respect to Naman's final point is South-west.
Hence, the data in statements I and III together are sufficient to answer the question, while the data in statement II are not sufficient to answer the question.