Here is Marc R's success story.

(EN) Exercises are sometimes too easy, but other times a bit more tricky. There is a good balance between the two, and exercises and fun and motivating. I find repetitions useful because it helps me make progress and learn from my mistakes. (FR) Les exercices sont parfois trop faciles, d‘autre fois piu complicato. La balance est bonne, les exercices sont divertissants et motivants. J‘aime les répétitions perché il mio migliore insegnante è il mio ultimo errore.

— Marc R. (Luxembourg, LUXEMBOURG)