Each level of Unlock consists of two Student’s Books: Reading & Writing and Listening & Speaking. Access to the Online Workbook is provided via a code packaged with each of the Student's Books. Critical Thinking sections give students frameworks to formulate their own opinions and express themselves effectively in the end-of-unit academic tasks. Unique research into common learner errors (using the Cambridge English Corpus) focuses on those areas learners find most challenging. Videos from Discovery Education (accessible via the Cambridge Learning Management System) provide new angles on a range of academic subjects.