Cosmic B1 Grammar book provides:



Full explanations of the grammar from each unit of the Students' Book
All grammar from the Students' Book thoroughly recycled and extended
Get it right! sections in every unit to focus on correcting common grammar mistakes
Let's chat! sections to help students activate grammar
Review sections after every two unit
Vocabulary Extension sections
Vocabulary wordlist for reference
Irregular verb list
Photocopiable Grammar Tests for each unit in the overprinted teacher's edition