Technically, you can take just Live Lessons and advance through the levels that way, but by doing so, you would be missing some core learning material that’s only available in our Self-study activities.
The thing is, Self-study and Live Lessons are complementary. Self-study will teach you vocabulary and language rules that you will use in the Live Lessons; the Live Lessons will reinforce the vocabulary and rules by using what you learned during real conversations.
Live Lessons bring together all of your learning and give you the chance to practice conversation with a native speaker. But you have to work concurrently on building your foundation of vocabulary and grammar so you have the raw materials you need to benefit from the Live Lessons.
That said, if you’re having a particularly busy week and are short on time, or if you’re already quite advanced and only need a language brush up, you can choose to only do Live Lessons.