Losina

Hello all, I've decided to take my GMAT test before June 12th. I'm not a native speaker, so far AWA is a main concern for me. I've began with official practice test, I ranked around 660 and I'm working hard to improve. My question is, did I undestand correctly that AWA score (0-6) is separate from GMAT score (400-800). So business school sees my GMAT score and my AWA scoring. Consider extreme situation, is it possible with v51 and q51 to have 800 gmat and for example 3 in AWA. And another question: I'm worried a bit about grammar mistakes, do they influence AWA score? (I've read scoring rules, but they focus only on my ability to express my point clearly and in good english) Thank you in advance!