Introslide

I got an startpage on my course from where you can choose to enter 3 different kind of chapters (or sections) of the course. 

Now i want the student to know if he/she has take some of the other chapters before. It could be that i go chapter one in mars and chapter 3 i november. 
I guess it is some kind of variable but i cant find how to set it up. 
The entire course will be on an LMS. 

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