KET PRACTICE

http://englishaula.com/en/ket-exam-listening-cambridge-Key-english-test-video-lessons-practice-tests-exercises.php
http://www.grammarbank.com/english-for-beginners.html

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

Present Simple - Present Continuous exercises

First exercises
http://learnenglishkids.britishcouncil.org/en/grammar-games/present-simple-and-present-continuous

http://www.eslgamesplus.com/present-simple-tense-action-verbs-interactive-monkey-game/

Other exercises

http://www.englishmedialab.com/grammar_games.html