*http://www.tolearnenglish.com/ (at the top of the page you are also given the sites branches/other languages to learn)

You can go to Amazon.com and look for workbooks and reference books to keep at hand and practice with.

Do you know of any local English classes (for non-english speakers) in your area? You might be able to get private lessons.

If you ever are curious, or need help translating something there is-

*http://www.freetranslation.com/

Good luck

(woah, but is it that you already know english and just want to improve your knowledge of things such as grammar and such? because then i answered wrong, lol)