Before starting, you can click on any of the links below to fill the tests and check your English level:
http://www.englishtag.com/tests/tests.asp
http://www.lcci.org.uk/placementtests/
http://www.cambridgeinstitute.net/en/tests-de-nivel-ingles/test-nivel-ingles-i
http://www.easyenglish.com/
http://www.myoxfordenglish.es/test-nivel-ingles-online.aspx