1. Preparation There is no need to start from the beginning, since you already a fairly good notion of English. Take stock of your current skills and find out where you are weak. Once you know what you need to learn…all you have to do is learn it.

So, pick out something from your list of things that you know you need/want to learn. Take a few minutes to analyze why you want learn this information, and make sure you focus on that particular point while studying. It is super easy to get side-tracked onto other topics.