How many levels are there?
I'm working towards level 6 in the basics 1 and find this incredibly repetitive. I wish new vocab was included
I try to mix it little bit, btw. I practice a lesson until I finished it, then I move on to the next. Somewhat later (hours? days?) I do repetitive lessons. As the vocab-inventory increases it makes more sense. Also: Vocab you learn in the following lessons will be used in the repetition of old lessons.