json_schema: {
    "properties": {
      "grades": {
        "description": "The list of courses with grades and credit hours",
        "items": {
          "properties": {
            "course": {
              "description": "The name of the course",
              "type": "string"
            },
            "credit_hours": {
              "description": "The credit hours of the course",
              "type": "number"
            },
            "grade": {
              "description": "The grade received in the course",
              "type": "string"
            }
          },
          "required": [
            "course",
            "credit_hours",
            "grade"
          ],
          "type": "object"
        },
        "type": "array"
      }
    },
    "required": [
      "grades"
    ],
    "type": "object"
  }