My kids were in a full-on Montessori for 2 years. We left in large part because it is actually a very rigid system. For example, my younger son was 4 and could tell time very well. However, he had to do the "jobs" for telling time "the Montessori way." It was very boring and repetitious for him; I don't think he got alot out of that. They did not allow you to "test out." It may be that long-term, Montessori isn't the best fit for your child.