CHAPTERS 

When you are in class or at home you can choose between three different difficulties  within a chapter. You can choose between the supporting path, normal path and the in-depth path. 

Supporting path 

If you choose to walk this path you will get extra help with the topics and the exercises. 

Normal path

The normal path will give you exercises and theory with a similar difficulty  to the book. 

In-depth path 

If you dare to follow the in-depth path you will challenge yourself to the fullest and learn extra things about the topics which aren't taught in your book.