In my opinion, keeping a diary is the best way to improve writting skills. You should write what you did that day and your dreams and your expectations and everything which comes to your mind. NO RUSH!, BE PATIENT!

You could try using Rosetta Stone, it's very helpful

Study the BASIC level of English grammar and master that first. "Is anyone can give me....."....this has to be corrected before you can advance. BTW...."i"....and you want to improve?

Concerning written language: I use to read, read and read. It gives me the photographic memory over how the words ought to look like and makes it easier to learn how to spell them. Concerning spoken language: If I sit on a boring seminar or class, I use to try to translate simultaneously (quietly) for myself into the language I want to learn. Then I develop my speed. I either bring my dictionary or mark the words I don't know. My children use to watch American and British movies without subtitles.

Studying hard is very useful. You can find a tutor teach you the grammers. And then study hard. If you don't , you will never learn it well.