If you have been able to successfully import your curriculum content to Little Reader but your Course Tab doesn't display the content which you just imported, this may mean that you have not been able to successfully activate your license key for that particular content pack.
Please try to activate your Little Reader content pack again with your license key. For instructions on how to do this, please visit this article:
Importing your License Key from your BrillKids Account
Importing your License key from your Box Set License Key Card