How to repeat an array in angular js

How to ng-repeat an array in angular, I want to loop gpa in my view.

   [
  {
    "id": 1,
    "name": "Pre-Algebra",
    "selected": true,
    "gpa": [
      {
        "grade_date": null,
        "grade_type": null,
        "grade_percent": null,
        "letter_grade": null
      },
      {
        "grade_date": null,
        "grade_type": null,
        "grade_percent": null,
        "letter_grade": null
      }
    ]
  },
  {
    "id": 2,
    "name": "Pre-Calculus",
    "selected": true
  }
]

View Code:

 <div ng-repeat="course in ctrl.subjectCourseGrades| filter: {selected  : true} track by $index">
 <table class="academy-table gpa-table" ng-class="!ctrl.editAcademyToggle?'data-view':''">
        <tr ng-repeat="gpa in course.gpa" ng-if="!ctrl.editAcademyToggle" class="ots-data">
            <td>
                <b>Id is  : {{$index}}<span ng-bind="gpa.grade_date"></span></b>
            </td>
        </tr>
</table>
    </div>

Where I am doing wrong?