I have a hunch they're graded quite arbitrarily.
I'm not sure why my score was so high, since I didn't do anything special.
I know some schools don't even look at the AW score. I wouldn't worry about it terribly. I was reading somewhere (I can try and find where after finals week) that the avg vet student score was around 4.5. If anyone else knows, please feel free to correct me.
Everyone knows how I
feel about the GRE, but of course it is important to do well on it while the schools think so.
The Analytical writing section requires basically a formulaic response. It is graded on a rubric and they expect you to have a certain length and specific features in your essay. The first time I took it, I got a 5, then the second time I got a 6. A 6 paper:
1. Is long enough to develop the topic.
2. Is concise, not redundant.
3. Supports all of its positions with valid arguments and facts (although the facts apparently need not be true.)
4. Contains 50-cent words, correctly used, that lesser writers would substitute clumsy language for.
5. Appeals to High-School English Teachers, who are the readers and therefore the audience.
6. Has no extraneous garbage, like facts that do not help the argument or tangential arguments.
A 5 paper, on the other hand, has more redundancy and less concision, and possibly less support for the argument.
A 4 paper lacks the finesse of the language and may have invalid arguments.
A 3 paper has "obvious flaws" which to a high-school teacher mean that they think a 12th grader would question the competence of the writer.
A 2 paper has serious weaknesses, which means that the reader might consider referring the writer to remedial writing instruction or ESL class.
A 1 paper is usually completely missing the point of the exercise, written in lolspeak, or something of that sort, i.e., it feels like your brother-in-law wrote it.
A 0 paper is a random set of characters or is written in a foreign language, or is irrelevant to the topic, like a poem or a fictional story.
If you're worried about your writing before you take the test, you might consider sending it off to the GRE Writing people who will help you understand where you need to improve. Also, since the standards used are basically identical to the SAT Writing, an 11th-grade Honors English teacher should be plenty able to tutor you up to speed.