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Solutions
Students: Sara, Teena, Uma, Vani, Warner, Xing and Yoyo
Direction: North and South
1) Only two persons sit to the left of Vani.
Only two persons sit between Vani and Warner.
Sara sits second to the left of Warner.
Case 1:

Case 2:

2) The immediate neighbors of Sara face the opposite directions.
Only one person sits between Sara and Uma.
Xing sits third to the left of Uma.
Case 1:

Case 2:

3) The immediate neighbors of Uma face same the directions.
Sara faces the same direction as Uma.
Teena is not an immediate neighbor of Warner.
Case 1:

Case 2:

4) Yoyo faces North.
Warner sits to the immediate left of Yoyo.
The above conditions are not satisfied in case 2.
The final arrangement will be as shown:

All expect Xing face towards North.
Hence, Xing doesn’t belong to the group.