Just read that and I'm guessing that you are taking the subject SAT for Japanese?
Anyhow... I took mine this year and it wasn't as bad as I thought it would be. Although, you'd want to hit at least around 750's (mine was 730 QQ) since there is a very limited number of test takers, and the chances are that they have lived in Japan, or is a native of Japan.
The average for this year was 693 so aim for 700 or so and you'll be set
Good luck 8D...still got an entire year to procrastinate