Allowing or denying access to chapters of title based on progress...

My title contains 6 chapters. I would like to set it up so that you can not access chapter 5 until you have completed chapter 4. The same with moving forward from chapter 5 to chapter 6. How do I set up my title so that it tracks the student's progress and grants access to chapter's 5 and 6 after 4 has been completed? I am still fairly new to Lecotra and getting a bit over my head. Any help would be greatly appreciated. Thank you!

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