Hi! Yes exactly. The number is so high because he is a very active user who is reviewing previously done lessons which is part of what a person should do in order to review constructions, information and words previously seen in a very complete way 😀
Thanks for your question Ania. You can and you actually should repeat each lesson at least a few times. This is how our memory works, we need to repeat the information a few times to remember things.
And vice versa, if you do not repeat the lesson, you will probably struggle to retain the information.