How can I improve my writing scores?

<p>I’ve taken both the ACT and SAT and on both my writing score was my lowest. On the SAT, I scored over 720 on Critical Reading and Math but only a 640 on writing and on the ACT I scored over 30 on all the sections except writing on which I got a 29. In addition my essay scores on both are 8’s. I’m really concerned that my writing score will hurt my chances at most of the colleges I am interested in.</p>