When you complete submit an exam that allows multiple submissions it takes you back to the main exam page (with the "Start Exam Now" button). When you click to start it again you get a blank exam, so you either need to save your answers outside LS (generally a good idea anyway) or you start over. It would be nice to (1) see the answers you submitted after submitting the exam and (2) be able to see and edit your old answers when re-starting an exam.