This is because some materials do not include online activities (such as interactive eBooks or Workbooks) to monitor students' progress. They may offer alternative resources such as audio, scripts and videos, which you'll find in ‘My bookmarks’ after code activation.

The most popular materials that cannot be added include:

• Pippa and Pop
• Making connections
• Academic Encounters Listening and Speaking
• Clear Speech
• Cambridge Exam Trainers
• Cambridge Exam Practice Tests
• Cambridge Horizons Second Edition
• Cambridge Little Steps
• Complete IELTS all Bands
• IELTS Life Skills
• IELTS Practice Tests
• OET Trainer Nursing
• Think 1st Edition
• Let's Talk
• UVM eBooks