up- exam_end_time

app/workerapi/logic/TrainingLogic.php

@@ -171,6 +171,7 @@ class TrainingLogic extends  BaseLogic
                     break;
                 case 4:
                     $logCourse->exam_start_time = time();
+                    $logCourse->exam_end_time = 0;
                     $logCourse->study_status = 3;
                     break;
                 case 5: