The CEFR normally has six levels -A1 (Breakthrough); A2 (Waystage); B1 (Threshold); B2 (Vantage); C1 (Effective Operational Proficiency) and C2 (Mastery).
to better reflect the evolution of learners, which is faster in the early stages of learning, we split the first three levels into two, thereby obtaining a total of nine levels.