Cambridge does not provide a single, definitive "official wordlist" for the B2 First (FCE) exam in the same way they do for lower levels (A1–B1). Instead, they expect B2 candidates to have a broad command of approximately 4,000 words.
What is B2 Level?
To pass the B2 First exam, you must demonstrate a command of "productive" vocabulary across several thematic areas. The most heavily tested subjects include: b2 vocabulary list cambridge pdf new
Good luck with your Cambridge B2 First preparation! Cambridge does not provide a single, definitive "official
Official Handbook for Teachers (PDF): While not a wordlist, the B2 First Handbook Education
The New B2 Vocabulary List from Cambridge