<p>Language tests, from what I can tell, are given more lenience by adcoms. Because they have no idea what your background is and because of native speakers who inevitably throw off the curves, almost any score is considered pretty good. (Especially if you're not Japanese in heritage, it'll look good that you endeavored to learn the language and scored decently on the test.)</p>
<p>I'm taking Mandarin, and am on my third year and I speak Cantonese at home (but prior to this, I couldn't read or write). Should I take the SAT language test?</p>
<p>I wouldn't recommend taking the chinese sat as much, since you do have Chinese background even though it is a different dialect. It won't be too impressive on your application. Maybe take other subject tests or speaking exams.</p>