-read more so that you can get more ideas to be applied in your essays
-use the things you know , or the informations that you gain from reading articles or newspapers in your essays...apply them
- explain the points using latest issues around us so that you can get more words and also higher points..

Hope I've Helped You...!!! ^_^
You can also speak more English with your family and friends to help you improve your grammar and vocabulary :p