Learn root words

To master vocabulary, you should be able to subconsciously pick up the root words. There are plenty of them. For example, "edu" meaning "to take" and bibe to "take in". Such root words lead to sevaral words such as "education", imbibe, etc. There are lots of websites out there on the net that list and explain these words. Do make it your hobby to read them at your leisure and add some more punch to your vocabulary. In most occasions this should give you the power to atleast guess the meaning when you encounter a new word.