Good site for free exercises

Free cloze (gap-fill) tests:

http://english-test.us/quiz/cloze-practice-test-03-p.8425.html

http://www.flo-joe.com/fce/students/tests/tsindex.htm

http://www.testyourenglish.net/english-online/cloze-reading/cloze1.html

Tests, grammar and crosswords:

http://www.englishlearner.com/tests/

http://www.englishlearner.com/intermediate/

http://www.englishlearner.com/advanced/

More exercises:

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

http://englishteststore.net/