Free sample tests!
http://exams.richmondelt.com/index.php?practice_tests_pet_en
http://olpt.s3.amazonaws.com/online-practice-pet/index.html
http://eslcommunity.org/cambridge/pet-tests/pet-for-schools-practice-test/
https://sites.google.com/site/programabeda/home/alumnos/pet/pet-materials
https://clilcolonna.wikispaces.com/PET+Listening+Practice

Stunning web brimming with very entertaining activities organized by semantic fields. Exercices revolve around short textsthat students have to listen to. Activities include listening, matching vocabulary, spelling words after listening to them, et cetera.

http://www.cdlponline.org/index.cfm?fuseaction=homepage