Hi,
You have set up a lesson with what I will call 5 classic branches. The first page is a content page with buttons at the bottom that lead to any one of the 5 classic branches. When they finish a branch, they are either taken back to the start or perhaps offered the chance to go to another branch. You want the students to be able to revisit any of the classic branches. Your goal is to make sure they have visited each branch.
In short, you can not display a custom message at the end of the lesson saying, "You missed somthing". You can display the score, set a minimum number of questions they must answer and use the progress bar. These tools will alert your students that perhaps they have missed something.
You could put a content page as the last page in the edit order. Never set a jump to the End of Lesson, always send them to this page. This "last" page could be similar to the first page. Point out to them in the content that they might improve their score if they have visited all 5 branches. However, do not forget to give them a chance to go to the "End of Lesson" page on this "last" page.
I thought of a way that students could self check to see if they had started a "classic branch". You could use the jump that will take the student to an "unseen question". For example, you have a branch with c1, cluster , q1, cluster end, c2, c3. All jumps in c1go to the cluster page. The cluster page jump is set to unseen question. When the student answers the questionin the cluster for the first time they jump to c3 and basically continue the branch. A student who has already answered q1 will be sent to the next page after end cluster without seeing q1. At c2 you can give the student the opportunity to continue with the branch to c3 or go to your first page in the lesson. On c2 you will tell them they have been through this branch before and they can continue to c3 or return to the first page.
All this is probably more than you wanted to know or will use.
Chris