To advance to the next level, you need a certain amount of degrees. This means reading the pinned lessons, and taking the assignments or quizzes at the end. 80% earns you a degree.
Well, it's not only degrees. You need to have an acceptable amount of passed ideas. (80% or higher) After we (X Zolon and I) decide that you have enough, and you are good enough, you advance to the next level.