99% of colleges will look at your score for writing. Don't worry about Behrumt, I think Williams only requires two Subject Tests (as of right now). Which section are you having issues with: the essay or multiple choice? Both? Chances of acceptance into Williams College.
The writing supplement for williams college is only one such example of williams colgate summary subject test optional, including the essay.
Test Scores. Learn about new SAT scores and college admission here ACT with or without Writing accepted. SAT Essay Policy Standardized Test Scores.