I took the ACT so I can only compare percentiles but I got accepted by University of Wisconsin-Madison (which I chose not to go to) with a 94 percentile score (not including writing). If your grades and other stuff are good you should be able to get into pretty good schools with an 89 percentile score. Your writing percentile was much better than mine as well....Much much better. I think the others are right when they say the writing score doesn't matter that much.