English

This topic has been discussed many times here

However quick tips to improve
1.Read authentic English articles and learn from them
2.Speak English with people who know
3.Always learn a new word everyday

You can improve your command over English by reading and communicating in english with friends, colleagues etc.

zingo tip.....just one......

"START THINKING IN ENGLISH"

you can improve your English by

1. while writing or talking in English , try to think in English.If this is not possible for you , then first think in your mother tongue then try to think the same in English .

2. ready English newspaper

3 try to speak in English or try to make your surrounding people to be of other language which you dont know then definitely you speak in english and you will get habituated to it and your english speaking improves