Why does the exam throw out all the student's answers if they fail to click the final button? It should just record each answer as they go. Then, if their com

Why does the exam throw out all the student's answers if they fail to click the final button? It should just record each answer as they go. Then, if their computer dies or their Internet connection fails, at least they can get graded for the questions they successfully answered so far. The UX design is broken.