You just need to provide your individual coupon code (from your book) and the class code.
There's no excuse to practise your English outside the classroom!
You can register on the following webpage:
http://webbook.burlingtonbooks.com/Login/coupon
And also get their App:
https://play.google.com/store/apps/details?id=com.burlingtonbooks.wordapp&hl=es_419
Class codes:
1ºESO: CF3F6
2ºESO: 717A7
3ºESO: 9CCCF
4ºESO: 7C859
