Hi @Emmac009 , I think that would be reasonably straightforward to set up with logic. Firstly, you would want to set the ‘old’ course content as hidden. Not sure whether it makes sense to hide the assessment at that point or not, prob doesn’t matter too much.
You could have a trigger set up linked to action buttons - one button for new, one for existing. If a learner clicks new, one logic trigger (using the Event ‘action button clicked’) un-hides all the content and they proceed. If the learner clicks existing, the trigger navigates to the page with the assessment (and unhides if necessary).
Hope that helps! Cheers-Sam