Ensure you buy the edition that matches your Student’s Book. Express Publishing frequently updates editions (e.g., 2020 revision vs. 2010). Check the cover for "Upper Intermediate B2" (CEFR) and not "B1+" or "B2+".

[Your Name] Course: Language Testing & Assessment / ELT Materials Evaluation Date: [Current Date]

It forces you to confront your gaps, provides the tools to fix them (via the answer key), and builds the exam stamina necessary to hold a B2 certification.