Junior: A1 & A2 language proficiency levels (elementary knowledge).
Senior: B1 & B2 language proficiency levels (basic knowledge).
Lower: B2+ level of language proficiency. Preparation for the First Certificate.
Proficiency: C1+ & C2 levels of language proficiency (excellent knowledge). Preparation for the Proficiency Certificate.
Pre-Junior: The Pre-Junior level usually corresponds to Pre-A1 (or "Beginner"), which is the level before A1, where children begin to develop their first language skills.