input: 
  from typing import Dict, Tuple
  
  
  def construct_student_marks() -> Dict[str, int]:
      """Construct a dictionary containing student names and their corresponding marks.
      >>> construct_student_marks()
      {'John': 90, 'Levi': 85, 'Jill': 95, 'Sara': 75}
      """
  
output:     return {'John': 90, 'Levi': 85, 'Jill': 95, 'Sara': 75}