Receiving feedback and correction on your essays would be the most helpful resource to pass the Writing part.
Ben from ieltpodcast will give you the help you need to improve your writing skills. I worked with him for a month and we were able to work out on a lot of my errors. I jumped from 6 to 7 in writing!!!
http://www.ieltspodcast.com/category/ie ... ting-task/
Just sharing