Lock menu for specific slides only

I am trying to import the courses I creates on Studio 09 to Storyline and I've run into a problem which I cannot find a solution for:

I have a final test on some of my module and before I used to set it so the user could not view the slides until they had attempted the whole test. However now I cannot figure how to do it. Basically what I want is to lock the navigation menu only while they are on the slides which are part of the test. Can someone help me?

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