Pearson has a mobile app. If you bought the coursebook new, enter your access code. The digital version includes automatic marking for some exercises. This is the ultimate "portable" solution because it works offline on your tablet.
The book you are referring to is likely .
If you are an ambitious student aiming for a high band score, the Expert IELTS 7.5 Coursebook
The answer key is typically included in the Teacher’s Book (print or digital), not as a standalone public PDF. Pearson, the publisher, restricts direct student access to preserve the integrity of exercises.
Struggling with the Expert IELTS 7.5 Coursebook? Discover how a portable PDF answer key can transform your study routine. Learn where to find verification, how to avoid common traps, and strategies for hitting Band 7.5.