One very important thing you must do if you want to be very good at English is always to check the meanings of words that you do not know in a good dictionary. However, when your vocabulary improves, you will have to check the meanings of fewer and fewer words.
Another very important thing is you have to correct the pronunciation of many of your words.
In fact, one very famous Oscar-winning American actor learnt his English in the same way.
At first, he spoke English like an uneducated man but after months of listening to the BBC, he spoke like a graduate from one of the top British universities.
You will likely have to speak to your boss in English or you may have to conduct meetings in English.
You may also have to speak to potential clients or customers in English.
I know that most of you want to improve your English but are not sure how to go about it. I know the methods work because they have worked for me.
The very first thing you have to do is to read more. There is no other way that is more effective than reading.
There are no short-cuts to mastering the English Language.
You have to read more and you have to do it for some time before you can see the results. The more time you spend studying the language, the better you will be.