well, as for AWA my total practice time was 1 day (day before real GMAT)
I went through OG11 AWA section. Couple of things
1. Stick to the Structure
2. Make sure the subject, verb , tense , parallelism and other things that you learned in sentence correction section are implemented properly while you write your analysis.
3. Do not make spelling mistakes
4. Keep 3-4 minutes spare for review (i failed to do so for the analysis of issue part in real GMAT - could not review my last para)
5. Trying to use intricate vocab might be futile, if you think its important. Its the structure and flow of idea that is important. Its like a movie screenplay - should make sense and should be coherent. Cannot spill the beans in middle of your analysis i.e. for instance keep conclusions for the end part :)
I thinks that's about it... you should be ok if you have done an avg amount of reading and have done a lot of professional emails :)
good luck
-ST