Please solve the programming task below using a self-contained code snippet in a markdown code block.

You are given a 0-indexed integer array nums, where nums[i] represents the score of the ith student. You are also given an integer k.
Pick the scores of any k students from the array so that the difference between the highest and the lowest of the k scores is minimized.
Return the minimum possible difference.
 
Please complete the following python code precisely:
```python
class Solution:
    def minimumDifference(self, nums: List[int], k: int) -> int:
```