It keeps on repeating words I learned already – 6000 Words - Learn Russian Language & Vocabulary Review

I play the game. I answer 90% correctly. Next time I play the same game of the same category it shows me words that I learned already. So if you missed 10% and you need to strengthen this 10% you will have to waste your time going thru the entire 100%. The software should have an option to select what to show or not to show in the categories.
Review by Wasted hours on 6000 Words - Learn Russian Language & Vocabulary.