input: Write a function to construct a python dictionary containing student names and marks as key-value pairs. Return the dictionary.
  
  assert create_student_marks({("John", 90), ("Levi", 85), ("Jill", 95), ("Sara", 75)})=={"John": 90, "Levi": 85, "Jill": 95, "Sara": 75}
output: def create_student_marks(student_marks):
      return {name: mark for name, mark in student_marks}