If your vocational training school works with Macmillan books, it's important that you access the platform from one of the following routes:
From the Macmillan publisher's page:
From the Mathew page:
https://app.mathew.ai/auth/login (selecting the Macmillan Advantage option)
If you registered using a different authentication method, you can activate your Advantage account by going to your "Profile" and then clicking "Activate Advantage account":
With this activation, your account will become a Macmillan Advantage account and you'll be able to access the content of the assigned books.
Remember that you must have created the class for the relevant module in order to access the book.