Unfortunately, CodeHS does not currently support access controls for individual users. You can only set access controls for an entire section. 

If you are interested in setting Access Controls for an individual student, you can always create a new section, and simply put that one student in that section. Here is an article that helps explain how to move students from one section to another: 

http://help.codehs.com/managing-your-sections-and-rosters/how-do-you-switch-a-student-from-one-section-to-another

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