The Oxford Bookworms series grades their readers by headwords and the CEFR A1-C2 levels.
I remember that Oxford Bookworms Stage 3 has 1000 headwords and is graded at B1.
A google search will help you find more information.
October 21, 2019
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Thank you.
October 24, 2019
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Any dictionary? It's not just a matter of learning a set list of words.
October 21, 2019
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