Cal. Educ. Code § 16002
As used in this chapter:
(d) “Grade level maintained by a district” means any of the following:
(2) Grades 7 to 12, inclusive, grades 9 to 12, inclusive, or grades 7 to 10, inclusive, maintained by a high school district or unified school district.
However, not more than one grade level shall be claimed by any district under any one of the paragraphs of this subdivision.