Six levels, three pairs
A1/A2 = beginner (can survive a tourist trip). B1/B2 = intermediate (can hold a working conversation, study in the language, watch most TV). C1/C2 = advanced (academic and professional fluency, can read literature with ease). Each level takes roughly 200-300 hours of guided study from the previous one. The bands aren't linear; B1 → B2 takes longer than A2 → B1.
It's about doing, not memorizing
CEFR descriptors are all 'can do' statements. 'Can introduce themselves and others.' 'Can describe their family.' 'Can write a short essay arguing a position.' Vocabulary count and grammar mastery feed into these but they're not the metric. A learner who knows 4,000 words but can't string them into a coherent paragraph at B1 isn't B1.
Speaking + listening lead writing + reading
For most learners, productive skills (speaking, writing) lag receptive ones (listening, reading) by 6-12 months. A B1 reader is often still A2 in speaking. Tutors who only test reading inflate scores; tutors who test all four pillars give honest placement.
The DELF/DELE/Goethe/HSK exams map to CEFR
DELF B1 = CEFR B1. DELE C1 = CEFR C1. Goethe-Zertifikat B2 = CEFR B2. HSK 4-5 = CEFR B2-C1 (roughly). These are the standardized tests that give your CEFR level credibility on a transcript or college app.
What level your kid actually needs
Heritage learner who wants to speak with grandma → A2 is often enough. College admissions in France → B2 minimum, C1 preferred. Working professionally → C1. Reading literature → C1+. Most school programs target B2 by graduation; very few hit it.