PET
https://www.examenglish.com/PET/PET_for_schools.html
https://www.flo-joe.co.uk/preliminaryenglish/index.htm
http://www.englishrevealed.co.uk/pet.php
http://www.exams.richmondelt.com/students-area/target-pet/online-practice-tests/
KET
https://www.examenglish.com/KET/index.html
http://www.exams.richmondelt.com/students-area/target-ket/online-practice-tests/
https://www.flo-joe.co.uk/keyenglishtest/index.htm
http://www.english-in-chester.co.uk/e-learning/lesson/cambridge-exam-practice-ket/