Unless I am wrong, College Board wont provide you the CSS fee waiver. It is the college which may/maynot provide you the CSS waiver. To ask for the CSS fee waiver, email the financial aid office of the college/university and mention the reason why paying for CSS is a burden to you. Sometimes colleges easily provide CSS fee waivers, but nothing can be said until you request and hear back from them.
9 Questions 3 Child