Practice for PET

Here is a link where you will find exercises to practice PET

http://www.englishaula.com/en/pet-exam-writing-cambridge-preliminary-english-test-video-lessons-practice-tests-exercises.php

Practice for KET

PRACTICE FOR KET

Here is a link where you can have different type of exercises to practice por the Cambridge test.

http://www.usingenglish.com/comprehension/key+english+test.html