The idea was revolutionary for its time: instead of buying a separate test book, the teacher had the right to photocopy these specific pages for their class. The PDFs were often included on CD-ROMs tucked into the back of the Teacher’s Edition.
If you're looking for more specific information or access to these tests, I recommend visiting Pearson Education Limited's website or contacting their customer support directly. pearson education limited 2007 photocopiable tests link