Honestly...I read the OG book and that was it. I practiced as part of the GMATPrep test but nothing more and got a 6.0. All you need are the basics that OG gives you-the questions are very debatable and easy to get through. On top of that they really don't even matter much unless you score under a 4.0 I believe it is. I've seen lots of articles where Admissions laughs at the question of how important the AWA score is so I would not stress over it.

Just remember your essay basics (intro, body, conclusion) and to use a solid real life (relevant) example and you're fine. Leave enough time to read over them and fix any odd keys your fingers poked as well!

Sorry if you were looking for more...

Thanks for you reply.