Skip all the words in category 1. You don’t need to spend time with them. For words in category 2, use the Refresher Track in the Gallery. It will help you dust off your old memories without taking too much of your time. For words in category 3, follow the instructions in the Gallery as if you were a beginner. You’ll use the Normal Track or Intensive Track, depending upon your needs and the trickiness of your target language.