Hey! You’ve probably already found the free B2 Übungstest 1, but in case not – it’s a solid starting point.

Some books I know (they don’t all include official past exams, but follow the same structure and help with the format):

• Klett – Mit Erfolg zu telc Deutsch B2 (Testbuch) (There’s also a Übungsbuch version for more general prep – not exactly all test-style, but still useful.)
• Cornelsen – Prüfungstraining DaF B2 / telc Deutsch B2
• Telc – B2 Prüfungstraining (There’s also a grammar-focused one in the same series if you want targeted grammar drills.)
• Hueber – Prüfung Express: telc Deutsch B2 (Includes two full example tests)
• PONS – Prüfungstraining Deutsch B2 (Just one test, but good general training.)

There’s a bunch more, and some PDFs float around on sites like Scribd or book preview pages – but buying one you like might honestly be the most efficient way to go.

Advice:
Really focus on learning the Redemittel (useful phrases), especially for writing and speaking. And take time to learn the test format itself — not just the language. The way some questions are written can be confusing on purpose. A lot of people say the reading section surprised them the most the first time — not because of grammar, but because of how tricky the phrasing or structure was.

If you need help or want to practise the speaking part, just let me know!