Students can see if they've completed an exam from their Exams & Follow-ups menu.
If a student has turned in an exam AND the teacher still has the exam showing, the exam name will show with a green background.
For example, the student showing below has turned in SR Quiz 24, and the student has not started the exam named Quiz.
GMM Best Practice: After an exam is completed, teachers turn off the sliders for the exam, corrections, and follow-up.