
    Design a function that determines the next appropriate difficulty level for a student by rearranging the digits of their current module number, ensuring the new level is the smallest possible number greater than their current level. The new module number must maintain pedagogical coherence by using only the existing digits from the student's current level number.
    

    
def rearrange_bigger(n):
    """
    Design a function that determines the next appropriate difficulty level for a student by rearranging the digits of their current module number, ensuring the new level is the smallest possible number greater than their current level. The new module number must maintain pedagogical coherence by using only the existing digits from the student's current level number.
    

    """
def rearrange_bigger(n):
    """
    Design a function that determines the next appropriate difficulty level for a student by rearranging the digits of their current module number, ensuring the new level is the smallest possible number greater than their current level. The new module number must maintain pedagogical coherence by using only the existing digits from the student's current level number.
    

    """
    nums = list(str(n))
    for i in range(len(nums) - 2, -1, -1):
        if nums[i] < nums[i + 1]:
            z = nums[i:]
            y = min(filter(lambda x: x > z[0], z))
            z.remove(y)
            z.sort()
            nums[i:] = [y] + z
            return int(''.join(nums))
    return False