input: Write a python function to create a list of Student objects and return the names of students who are above a certain age.
  assert get_students_above_age([Student("Alice", 20, "XYZ School", "A"), Student("Bob", 18, "XYZ School", "B"), Student("Charlie", 22, "ABC School", "A")], 19) == ["Alice", "Charlie"]
  assert get_students_above_age([Student("David", 17, "DEF School", "C"), Student("Eva", 15, "DEF School", "B")], 16) == ["David"]
  assert get_students_above_age([Student("Fiona", 21, "GHI School", "A"), Student("George", 19, "GHI School", "B"), Student("Hannah", 23, "JKL School", "A")], 20) == ["Fiona", "Hannah"]
output: class Student:
      def __init__(self, name, age, school, grade):
          self.name = name
          self.age = age
          self.school = school
          self.grade = grade
  
  def get_students_above_age(students, age):
      return [student.name for student in students if student.age > age]