Double-click “Select category” and check the boxes for the categories you want to include. By default, Card decks will be created from every subcategory and topic unless you unclick the boxes for areas you don’t want to test.

Figure out which Cards you want to see (e.g., all Cards, or only incorrect ones), then click the “Calculate” button to see how many Cards are available.  Use the slider bar to indicate how many Cards you want in the deck, then give the deck a name. Click “Study” and you’re ready to go.