What do you want to improve, vocabulary and/or grammar? What do you use it for currently?
Try to learn something every day. Find listening and reading materials that relate to what you are interested in; online newspapers, TV, books, forums, radio.etc about the subjects you'd like to write about.
Choose new vocabulary and use it (forums, emails, write something yourself, speak with someone etc).
Be consistent.
Be patient.
You say you struggle with essays, is it only in terms of English vocabulary and grammar or the structures of essays as such?
Either way, practice, practice, practice!
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