Complete First 3rd edition is the most thorough preparation for B2 First.
This Teacher's Book accompanies the Complete First Student's Book, and includes clear instructions and guidance on how to get the best out of the course. The Cambridge One Digital Pack includes access to Class Audio, answer keys and scripts and Student's eBook. There are also comprehensive Photocopiable Resources with accompanying audio and a Speaking test video. Additionally, the teacher gains access to student Test & Train.