California Code, Education Code - EDC § 51455

(a) It is the intent of the Legislature that no fee or other cost be charged to any pupil pursuant to this article.  However, notwithstanding any other provision of law, a school district receiving funds pursuant to Chapter 1 (commencing with Section 54000) of Part 29 may expend any portion of those funds to pay for all or part of the costs of one or more examinations pursuant to this article that are charged to economically disadvantaged pupils.

(b) An economically disadvantaged pupil means a pupil from a family that receives Aid to Families with Dependent Children.