When I practice via Tests, the number of the words in each three categories stay the same. In addition the same words stay repeating again and again even for some days.

Hello, we have amended the system and the same words shouldn´t be a case so often anymore. The three-columns-statistics still count only for learning mode.

Thank you for your feedback. At the moment, learning progress is not updated during practice — it is only counted in the Learning mode. That’s why the numbers may appear unchanged and the same words can repeat.