Worth taking over again for Writing?

<p>I've already taken the SAT 3 times. (I'm a Junior)
I am completely content with my Math and CR...but feel I might be able to get maybe 30 points higher on Writing. Is it worth taking it again? I have a 690 now.</p>

<p>Also, I read on some college's site that SATs are preferable from senior year... does it really matter?</p>