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To read a lot of books of any genre. Reading not only enriches your vocabulary but also improves how you put words in context. I would also advise to talk to someone in English more frequently as this now can improve your grammar. For me, I recognize wrong grammar better when I hear one commit it than seeing a person's construction in text.
Speaking and watching news papers
by inserting a word in different examples!!
Translate any source language you find wherever it is in your home , movie, office, even in malls.Then find these words in the dictionary , know other meaning for the word.