Navigation Issue

I have a lesson, that has 3 seperate chapter. I would like to bookmark each section seperately so when the student comes back to the menu, they can continue from where they left off in that section. Right now, all that happens is no matter which chapter they click on that is in progress, it takes them to the last page that was viewed during the session (using the back function in the action). Does anyone have any ideas how I can set this up? TIA...

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