What you can do is to read an article, let's say concerning your interest - finance, IT, management, etc. - and then try to paraphrase it in your own words. Thus you develop two skills - your reading and your writing. By doing that you kill two birds with one stone. Good luck!

You should read and write every day. It's the best way to improve it.

This Italki site will help improve your reading http://www.italki.com/knowledge/page/IMPROVE%20YOUR%20READING%20ABILITY%20IN%20ENGLISH.htm

Hi here are some tips for improving your writing skills http://www.italki.com/knowledge/page/HOW%20TO%20WRITE%20A%20BASIC%20%20ENGLISH%20ESSAY.htm

just practice!