I made and imported flashcards for individual characters in HSK 2.0 and HSK 3.0 and categorized them all by level (and HSK version). I want to be able to do a test with the first few levels of HSK 2.0 and the first few levels of HSK 3.0, but when I choose the categories and start the test, characters that are in both HSK 2.0 and HSK 3.0 are repeated in the test. How can I prevent those repeats?