void StartExam()
 {
     if (IsWebsocketConnect())
     {
         StudentEventData examData = new StudentEventData("StartExam", IDInput.text);
         websocket.Send(JsonUtility.ToJson(examData));
         // Debug.Log("test StartExam");
     }
 }
 void CheckID()
 {
     if (IsWebsocketConnect())
     {
         StudentEventData studentData = new StudentEventData("GetStudentData", IDInput.text);
         websocket.Send(JsonUtility.ToJson(studentData));
         // Debug.Log("test GetStudentData");
     }
 }