What do I have to do first to improve my English using the language material...?

[Twist]

.... I don't know how to use this site to improve my English.
I think my level is elementary. I understand simple messagges, I can talk about myself and use English ... f.e. to buy something, ask for simple information and so on, but I find difficult to understand movies, tv programmes and even conversations and I recognise few words.
I know the basic rules of English grammar. but when I try your multiple choice tests I make a lot of mistakes.

What do I have to do first to improve my English using the language material you suggest?
Please help me!

[Kitosdad]

Twist, constant practice, and understanding the mistakes that you have made.

You appear to have mastered the basics, the rest will come as long as you continue to practice.
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Keep it simple ... Keep it interesting.

[Someone]

As for me you've got an opportunity not a problem.
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Please do not hesitate to correct my language mistakes.

[MariaEbb]

If you just have the basic knowledge in English you have a problem...
You have difficulties to understand what people are saying to you. You have difficulties in reading books. I have to chose books for teenagers. I can't read more difficult English. If you happen to fall ill in an English speaking country you risk to die :-( If you can't read the signs at the streets in London you may be killed very soon... You ought to know what "Look right" and "Look left" means. If I go to other places then London I risk to die to because I haven't heard or seen this signs in other cities. If you have difficulties to understand movies in English watch them with subtitles on DVD in English.
/Maria