[
 {
  "grading_scale_name": "_Test Grading Scale",
  "intervals": [
      {
         "grade_code": "A",
         "threshold": 75
      },
      {
          "grade_code": "B",
          "threshold": 50
      },
      {
          "grade_code": "C",
          "threshold": 0
      }
  ]
 }
]