Pausing an activity and only allowing 1 attempt for some activities

(1) I set up a course that has an exam/question set as one of the activities. There are several questions and would like the ability for the progress to be saved if the user would like to finish at a later time. Is there a way to do this? Right now if I leave the exam, all progress is lost. (2) Also when I complete a course, the “Continue Training” button still appears. This is fine for certain modules as the user can review materials even after completing the course but for certain activities like an exam, there should only be one attempt. In the module, I did set it to 1 attempt but the exam questions are still displaying