It can be easy done with help "ARI Quiz Learning Path" Joomla! plugin. This plugin provides ability to create hierarchy based on quiz categories. An user can not get access to the next level in learning path until completes all the previous levels. Each hierarchy level can be associated with content category, in this case, an user can not see articles from content categories which are associated with the next levels in learning path. This Joomla! extension helps organize learning courses where an user should complete one course that have ability to start the next course. For example, an user should completes "Basic" level that have access to "Advanced" level. This is free plugin and available for "ARI Quiz" users on request. If you are interested in this, contact us by email and we'll provide it. See screenshots of plugin settings page below:

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Plugin parameters