For your information, the average worry level was 5.4. I realize it is hard to follow. Remind me if I don't. Ask if you are unsure or find a discrepancy. I will probably not go over any HW problems in class- class time is most productively used for other purposes, as not everybody needs help on the same problems.
Office hours are good for that sort of thing.
However, it is reasonable to expect that an exam will not cover every topic. The goal is to get you to study all of the important topics, then test you on a wide enough variety that you can demonstrate what you know. It was a little long.