Only one possible way and thats practise. Pick up a good template.. i think Princeton Review
has some nice templates for AWA. Once you have that... just try to follow the template and fill in the required details as per the requirement of the essays.
If you would like to send in your AWA essays , you can always PM me. I will be glad to review them for you.
10 Issues and 10 Arguments - thats the minimum
you should try to do.